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control/warning messages, function - GF54.30-P-2001LE

MODEL 216.3, 221.0 /1 as of model year 2009 /YoM 08 

Function requirements, general 

IMPORTANT The EZS control unit (N73) sends the status of circuit 15 to the instrument cluster (A1) via the chassis CAN (CAN E), central gateway control unit (N93) and central CAN (CAN F).

control/warning messages, general 

The instrument cluster control/warning messages notify the driver about the current state of the systems installed in the vehicle.

The instrument cluster can issue indicator and warning messages in the following ways:

Visual control/warning messages:

The visual indicator and warning messages are displayed using the following instrument cluster components:

Audible control/warning messages:

The acoustic indicator and warning messages are issued using the following instrument cluster components:

Variable indicator lamps and warning lamps in multifunction display:

The variable indicator and warning lamps are displayed in the multifunction display. They can change their position in the multifunction display depending on the request.

The following indicator and warning lamp are variable indicator and warning lamps:

The messages inserted in the multifunction display are subdivided into four categories corresponding to their urgency:

The control/warning messages consist of the following subfunctions:

Function sequence for hybrid readiness indicator (on model 221.095/195) 

When the ignition is switched on, the ME-SFI [ME] control unit (N3/10) and the battery management system control unit (N82/2) check whether the hybrid drive is ready for operation.

If the internal combustion engine is switched off due to a hybrid request, the readiness indicator "Ready" appears in the instrument cluster.

As soon as the internal combustion engine is started again due to a hybrid request, this display disappears.

The battery management system control unit transmits the appropriate information to the instrument cluster via the drive train sensor CAN (CAN I), ME-SFI control unit, chassis CAN, central gateway control unit and central CAN.

Additional function requirements for regenerative braking system control/warning messages (on model 221.095/195) 

Function sequence for regenerative braking system control/warning messages (on model 221.095/195) 

With regenerative braking a part of or the total braking torque is produced by the integrated starter alternator (A79). The electrical energy produced here is used to charge the high-voltage battery (A100g1) in the high-voltage battery module (A100). During regenerative braking, the instrument cluster actuates the regenerative braking system indicator lamp (A1e20). The ME-SFI control unit transmits the corresponding request to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.

If the regenerative braking system control unit (N30/6) detects an ESP malfunction, the ABS indicator lamp (A1e17) lights up and appropriate messages additionally appear in the multifunction display. The instrument cluster actuates the ESP warning lamp in the event of an ESP control intervention function.

The regenerative braking system control unit transmits malfunction messages and fault messages via the chassis CAN.

The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.

Function sequence for passive ESP switching 

Up to 31.8.09:

The ESP can be switched to passive mode manually by pressing the ESP OFF switch (S6/2s11) while the engine is running. The upper control panel control unit (N72/1) reads in the status of the ESP OFF switch via the instrument panel LIN (LIN 1) and sends it via the interior CAN (CAN B) to the central gateway control unit and from there via the chassis CAN to the ESP control unit (N47-5) and via the central CAN to the instrument cluster in order to actuate the ESP indicator lamp.

As of 1.9.09

The ESP can be switched to passive mode manually in the "Assistance" menu. If the ESP is switched to passive mode, the instrument cluster actuates the ESP indicator lamp. The instrument cluster sends the ESP status "activated" or "deactivated" via the central CAN to the central gateway control unit and via the chassis CAN to the ESP control unit (except model 221.095/195) or to the regenerative braking system control unit (on model 221.095/195).

Additional function requirements for cruise control control/warning messages (on model 216 without code (219) Distronic (DTR) or without code (233) DISTRONIC PLUS) 

IMPORTANT The vehicle speed is calculated from the wheel speeds that the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) makes available via the chassis CAN, central gateway control unit and central CAN.

Function sequence for cruise control control/warning messages (on model 216 without code (219) Distronic (DTR) or without code (233) DISTRONIC PLUS) 

The cruise control then regulates the vehicle speed to an adjustable value. The cruise control is activated using the CC [TPM] push button (S40/4).

The cruise-control control/warning messages consist of the following subfunctions:

Function sequence for cruise control display 

If the cruise control is on, the stored speed is shown for t =5 s in the multifunction display and by a triangle in the electronic speedometer (A1p8).

The speedo scale in the electronic speedometer is shown in the form of an open segment ring. The individual segments symbolize various speed ranges and are actuated with different brightness and color. The segment ring lights up between the set speed and the maximum speed.

Function sequence for variable speed limiter display (without code (494) USA version) 

The variable speed limiter governs the vehicle speed to a configurable value that lies between v = 30 km/h and the maximum speed. If the variable speed limiter is switched on, the segment ring in the electronic speedometer lights up between the minimum speed and the set speed limit.

Permanent limiter display function sequence (without code (494) USA version) 

The vehicle's maximum speed can be permanently governed on the instrument cluster to a value between 160 km/h (e.g. for winter tire operation) and the maximum speed.

A warning message appears in the multifunction display if the set speed is exceeded. In addition, the instrument cluster actuates the warning buzzer. The permanent limiter can only be switched on and off in the corresponding menu in the instrument cluster.

Additional function requirements for Distronic control/warning messages (with code (233) DISTRONIC PLUS or on model 216 up to 31.8.10 with code (219) Distronic (DTR)) 

Function sequence for Distronic control/warning messages (with code (233) DISTRONIC PLUS or on model 216 up to 31.8.10 with code (219) Distronic (DTR)) 

Distronic regulates the vehicle speed so that a minimum distance to the vehicle ahead is maintained. Distronic is activated by pressing the cruise control push button. If the Distronic is switched on, the stored speed is marked by a triangle in the electronic speedometer.

If the Distronic recognizes a vehicle ahead, the segment ring in the electronic speedometer lights up brightly between the speed of the vehicle in front and the stored speed.

In addition, a tracking graphic appears in the multifunction display. In this pursuit graphic one's own vehicle is shown on the right on the edge of the picture as well as the vehicle ahead shown on the left on the edge of the picture.

In addition the following information is displayed:

Additionally, if distance warning is switched on, the distance warning status indication (A1e23) lights up. If the vehicle undershoots the safe distance to the vehicle in front, the DTR controller unit (A89) sends an appropriate signal via the vehicle dynamics CAN (CAN H) to the radar sensors control unit (SGR) (N62/1) (with code (233) DISTRONIC PLUS, without code (237) Active Blind Spot Assist, without code (238) Active Lane Keeping Assist, model 221 with code (239) Plus Light adaptive cruise control) or to the video and radar sensor system control unit (N62/2) (with code (237) Active Blind Spot Assist, with code (238) Active Lane Keeping Assist). The radar sensors control unit or the video and radar sensor system control unit forwards this signal via the chassis CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives the signal and actuates the DTR warning lamp.

Additional function requirements for Safety Brake Control indicator/warning messages 

Function sequence for Safety Brake Control indicator/warning messages 

If the ESP is switched to passive mode or with an ESP control intervention function, the instrument cluster actuates the ESP warning lamp. If the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) detects ESP malfunctions, the ABS indicator lamp (A1e17) lights up and appropriate messages additionally appear in the multifunction display. Fault messages are placed on the chassis CAN by the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195). The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.

Additional function requirements for supplemental restraint system control/warning messages 

Function sequence for control/warning messages for supplemental restraint system 

If there is a fault in the supplemental restraint system, the restraint systems control unit (N2/7) sends corresponding information via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

The instrument cluster receives this information, actuates the airbag indicator and warning lamp (A1e15) and issues appropriate messages via the multifunction display.

Additional function requirements, PRE-SAFE warning messages 

PRE-SAFE warning messages function sequence 

If a fault is present in the PRE-SAFE system, the left front reversible emergency tensioning retractor (A76) (on model 221) or the right front reversible emergency tensioning retractor (A76/1) (on model 221) sends appropriate information via the chassis CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives this information, actuates the airbag indicator and warning lamp (A1e15) and issues appropriate messages via the multifunction display.

Function sequence for STH warning messages (with code (228) Stationary heater) 

The function of the STH is monitored by the STH control unit (A6n1) (model 216) or by STH or ZUH control unit (A6n1) (model 221).

If the STH control unit detects an error or a malfunction in the STH, it sends a corresponding signal via the interior CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives the signal and issues a corresponding message via the multifunction display.

Additional function requirements for tire pressure loss warning (without code (475) Tire pressure monitor (Premium)) 

Tire pressure loss warning function sequence (without code (475) Tire pressure monitor (Premium) 

A pressure loss at one of the tires is recognized by the change in wheel circumference and the associated change in wheel speed. If the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) detects a pressure loss at a tire, it sends a corresponding signal via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

The instrument cluster receives this signal and issues a corresponding message on the multifunction display.

Additional function requirements for tire pressure monitor warning messages (with code (475) Tire pressure monitor (Premium)) 

Function sequence for tire pressure monitor warning messages (with code (475) Tire pressure monitor (Premium)) 

If the RDK control unit (N88) identifies a pressure loss on a tire, it transmits a corresponding signal

The central gateway control unit relays the signal via the central CAN to the instrument cluster.

The instrument cluster receives this information, actuates the tire pressure monitor warning lamp (A1e66) and issues appropriate messages via the multifunction display.

Function sequence for memory adjustment control messages (on model 216, on model 221 with code (275) Memory package (driver seat, steering column, mirrors)) 

When storing a memory position, the left front seat control unit (N32/1) or right front seat control unit (N32/2) transmits a request to output an acknowledgment tone to the instrument cluster via the interior CAN, central gateway control unit and central CAN.

The instrument cluster receives this request and outputs the acknowledgment tone.

Additional function requirements for audio/communication/navigation control messages 

Function sequence for audio/communication/navigation control messages 

The information on audio systems fitted in the vehicle is shown in the multifunction display.

Furthermore navigation information is shown in the multifunction display. The instrument cluster receives the information from the COMAND controller unit (A40/3) via the central CAN.

In addition the telephone book is displayed via the multifunction display and can be processed accordingly. The COMAND controller unit passes on the required information to the instrument cluster via the central CAN.

Additional function requirements for Keyless-Go control/warning messages (with code (889) Keyless Go) 

Function sequence for Keyless-Go control/warning messages (with code (889) Keyless Go) 

If, during a start attempt, the KEYLESS-GO control unit (N69/5) does not recognize a valid transmitter key (A8/1) or the DIRECT SELECT gear selector switch (S16/13) is not in the "P" or "N" position, a message appears in the multifunction display. The KEYLESS-GO control unit transmits the corresponding information via the interior CAN.

The steering column tube module (N80) transmits the status of the DIRECT SELECT gear selector switch via the chassis CAN. The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.

Function sequence emergency call system indicator/warning messages (with code (359) TELE AID emergency call system) 

The vehicle-related services are shown in the multifunction display. If the emergency call system control unit (N123/4) establishes a fault on a self-test or if the emergency call system is activated, an appropriate message appears in the multifunction display. The emergency call system control unit transmits the information necessary for this via the diagnostic CAN (CAN D), central gateway control unit and central CAN to the instrument cluster

Additional function requirements for AIRmatic control/warning messages (on model 221 without code (487) Active Body Control (ABC), on model 216 with code (489) AIRmatic (air suspension with continuous damper adjustment)) 

IMPORTANT The status of circuit 61 is sent by the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (with gasoline engine) via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

Function sequence for AIRmatic control/warning messages (on model 221 without code (487) Active Body Control (ABC), on model 216 with code (489) AIRmatic (air suspension with continuous damper adjustment)) 

If the AIRMATIC with ADS control unit (N51) identifies a fault in the AIRMATIC system, it sends corresponding information via the chassis CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives this information and issues corresponding messages via the multifunction display. There are various system messages or warning messages with different fault priorities. If several faults exist at the same time, they are all displayed.

Additional function requirements for Active Body Control (ABC) control/warning messages (on model 221 with code (487) Active Body Control (ABC), on model 216 without code (489) AIRmatic (air suspension with continuous damper adjustment)) 

Function sequence for ABC control/warning messages (on model 221 with code (487) Active Body Control (ABC), on model 216 without code (489) AIRmatic (air suspension with continuous damper adjustment)) 

The ABC system offers the driver different vehicle level settings. The set vehicle level is shown in the multifunction display. Setting is performed via the level control switch (S6/2s10).

It is also possible to change the suspension tuning using the transmission mode button (A40/9s8). The corresponding selection is shown in the multifunction display as well. The upper control panel control unit reads in the status of the level control switch and the status of the transmission mode button via the instrument panel LIN and transmits them on the interior CAN.

System and warning messages with operating instructions for the driver are also shown on the multifunction display. For this purpose, the ABC control unit (N51/2) transmits corresponding information on the chassis CAN. The central gateway control unit forwards this to the instrument cluster via the central CAN.

Additional function requirements for parking system control/warning messages (with code (220) PARKTRONIC or on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (230) Exclusive parking assist) 

IMPORTANT The "trailer recognized" status is transmitted by the trailer recognition control unit (N28/1) on the interior CAN.

The ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) sends active ABS/ESP control intervention functions to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.

Function sequence for parking system control/warning messages (with code (220) PARKTRONIC or on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (230) Exclusive parking assist) 

PARKTRONIC:

PARKTRONIC is displayed by means of a bar graph display in the electronic speedometer and on the rear headliner. In addition an acoustic warning sounds depending on the distance to the obstacle.

The PTS control unit (N62) transmits the corresponding requests

The central gateway control unit forwards them to the instrument cluster via the central CAN.

The PARKTRONIC function can be manually deactivated or activated using the PTS OFF switch (S6/2s12). The light emitting diode in the PTS OFF switch lights up when the PARKTRONIC function is deactivated.

The status of the PTS OFF switch is read in by the upper control panel control unit via the instrument panel LIN and is passed on to the PTS control unit via the interior CAN, central gateway control unit and chassis CAN. As a result of this the PTS control unit deactivates or activates the PARKTRONIC function.

Parking system (without code (498) Japan version in model 221 as of 1.6.09 or in model 216 as of 1.9.10):

Based on the PARKTRONIC function the parking assist system indicates potential longitudinal parking spaces in the multifunction display after it has measured them.

The measurements are made by the outer left front PTS ultrasonic sensor (B8/1) or outer right front PTS ultrasonic sensor (B8/6), located in the side of the front bumper.

The data from the corresponding PTS ultrasonic sensor are read in and evaluated by the PTS control unit.

If the system measures a possible lengthwise (parallel) parking space, a white highlighted "P" symbol appears in the multifunction display. Provided that the longitudinal parking space is defined as suitable, a blue stored "P" symbol with direction arrow appears in the multifunction display.

The PTS control unit transmits corresponding information for this to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.

Provided that the vehicle has stopped with the usual parking distance to the longitudinal parking space shown and reverse gear is engaged, the multifunction display in the strip speedometer changes and shows the vehicle schematically from a bird's eye view in its position relative to the parking space.

Guide lines and steering instructions are displayed to ensure the driver parks the vehicle optimally. The output of chimes points out the proximity to an obstacle.

The intelligent servo module for DIRECT SELECT (A80) sends information about the current transmission selector lever position to the PTS control unit via the drive train CAN (CAN C), ME-SFI [ME] control unit or CDI control unit and chassis CAN.

Additional function requirements, ATA control/warning message (with code (551) Antitheft alarm system (ATA)) 

Function sequence for ATA control/warning messages (with code (551) Antitheft alarm system (ATA)) 

The rear SAM control unit with fuse and relay module (N10/2) is the master control unit for the antitheft alarm system. The rear SAM control unit transmits fault messages and information messages to the instrument cluster via the interior CAN, central gateway control unit and central CAN. The instrument cluster receives this data and then issues corresponding messages on the multifunction display.

Function sequence for Night View Assist warning messages (with code (610) Night View Assist) 

The Night View Assist control unit (N101) monitors the Night View Assist function. If the Night View Assist control unit identifies an error or a malfunction, it sends corresponding information

The instrument cluster receives this data and then issues corresponding messages on the multifunction display.

Additional function requirements for ATTENTION ASSIST control/warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10) 

In the first t = 20 min. of monotonous driving individual parameters and a warning threshold are determined by the driver. When the

Function sequence for Attention Assist control/warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10) 

Attention assist assists the driver on long monotonous trips e.g. on freeways and expressways in a vehicle speed range of v = 80 to 180 km/h.

If attention assist establishes driver fatigue or increasing inattentiveness, it proposes a break. The attention assist assesses driver fatigue or increasing inattentiveness by the analysis of steering ability by means of steering wheel angle signals as well as driving conditions (time of day/night, driving time).

warning threshold is reached a visual as well as an acoustic warning message are issued by the instrument cluster.

The ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) sends the appropriate request to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.

The multifunction display in the instrument cluster then displays a prompt telling the driver to take a break, and a warning tone sounds.

IMPORTANT An active warning can be confirmed and thus terminated using the OK button (S110s6) on the left multifunction steering wheel button group (S110). The next warning is only possible after t > 15 minutes. The status of the multifunction steering wheel button group is made available to the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) via the steering LIN (LIN E1), steering column tube module and chassis CAN.

Additional function requirements for automatic lane recognition warning messages (as of 1.9.10 with code (238) Active Lane Keeping Assist or on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (476) Automatic lane recognition) 

Function sequence for automatic lane recognition warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (476) Automatic lane recognition or as of 1.9.10 with code (238) Active Lane Keeping Assist) 

The automatic lane recognition function recognizes when the vehicle pulls out of a lane and warns the driver so that he/she can react accordingly.

The traffic space in front of the vehicle is recorded and evaluated by the multifunction camera (A40/11). As soon as a front wheel touches or drives over the road marking, the multifunction camera issues the request to output the haptic warning. This takes place by actuating the steering wheel vibration motor (M99).

The current status of the automatic lane recognition function is shown in the multifunction display.

IMPORTANT With code (238) Active Lane Keeping Assist, lane-correcting intervention by the brake system is requested if the driver does not react fast enough.

Additional function requirements for Speed Limit Assist control/warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (513) Speed Limit Assist) 

Function sequence for Speed Limit Assist control/warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (513) Speed Limit Assist) 

The Speed Limit Assist function records the speed limits shown for the stretch being driven on by the vehicle. These are shown in the form of a traffic sign in the multifunction display.

The Speed Limit Assist function status is shown by a symbol in the multifunction display.

The display concept distinguishes between the following modes:

Permanent display:

In the case of permanent display in the multifunction display, the detected speed limit is displayed permanently until one of the following events occurs:

Information mode:

In information mode the recognized speed limit can be displayed in the form of a traffic sign for a period of t = 5 s. This information can be acknowledged within this period. The information mode can be switched on or off by the driver.

The multifunction camera transmits corresponding requests for the control of the display via the chassis CAN, the central gateway control unit and central-CAN to the instrument cluster.

Additional function requirements for Adaptive Highbeam Assist control message 

For this purpose, the multifunction camera transmits corresponding information via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

Additional function requirements for trailer recognition control/ 

(on model 221 as of 1.6.09 or model 216 as of 1.9.10 with code (608) Adaptive Highbeam Assist) 

Function sequence for Adaptive Highbeam Assist control message (on model 221 as of 1.6.09 or model 216 as of 1.9.10 with code (608) Adaptive Highbeam Assist) 

The adaptive highbeam function is an assistance function in which the headlamp range of the xenon bulbs is adapted to the distance of the nearest road user in front or approaching from the opposite direction. The status of the adaptive high beams function is shown in the multifunction display.

warning messages (on model 221 with code (550) Trailer hitch) 

Function sequence for trailer recognition control/warning messages (on model 221 with code (550) Trailer hitch) 

If the trailer recognition control unit identifies a malfunction in the electrical system (e.g. exterior lights) then a corresponding signal is relayed via the interior CAN, central gateway control unit and central CAN to the instrument cluster.

The instrument cluster outputs the respective fault message in the multifunction display.

Additional function requirements for door open reminder warning 

Function sequence, door open reminder warning 

If an open door, open trunk lid or open engine hood (with code (551) Antitheft alarm system (ATA [EDW])) is detected at a speed of v > 3 km/h, the instrument cluster issues an acoustic warning and displays an appropriate message in the multifunction display. The following control units provide the status of the doors, trunk lid and engine hood available via the interior CAN:

The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.

Additional function requirements for exterior lighting (ABL) warning messages 

Exterior lighting (ABL) function sequence 

The functions of the relevant exterior lighting (ABL) components are permanently monitored.

If a fault is detected at a component, the monitoring control unit transmits an appropriate signal on the interior CAN. The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN. The instrument cluster receives this data and issues a corresponding message on the multifunction display.

The following control units monitor the function of the relevant exterior lighting (ABL) components:

On model 216, model 221 (as of 1.6.09) and model 221 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination) (up to 31.5.09), the xenon headlamp control unit at the left front lamp unit and the xenon headlamp control unit at the right front lamp unit monitor the cornering lights and dynamic curve illumination functions.

If a xenon headlamp control unit identifies a fault or the failure of a relevant component, it sends corresponding information via the front end CAN (CAN G), central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives this data and then issues corresponding messages on the multifunction display.

Additional function requirements for lights on reminder 

Lights on reminder function sequence 

The message "Switch off lights" appears in the multifunction display. Standing lights may be on due to low beams having been switched on manually, auto on/off headlamps having been switched on, daytime running lights being on or because they have been switched on manually by means of the rotary light switch (S1).

If the standing lights have been activated by manually switching on

The logic for actuating the lights on reminder warning function is stored in the instrument cluster. The front SAM control unit transmits the status "Standing lights actuation active" to the instrument cluster via the interior CAN, central gateway control unit and central CAN.

The status of the driver door is provided by the left door control unit or left front door control unit on the interior CAN and the current status of circuit 15 is provided by the EZS control unit on the chassis CAN.

The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.

The instrument cluster combines this with the status of the headlamp switch-off delay (SWA) function and actuates the warning buzzer accordingly.

the low beams, the auto on/off headlamps or the daytime running lights and the driver door is then opened when a transmitter key is inserted in the EIS [EZS] control unit, the standing lights are switched off.

If the transmitter key is removed from the EIS [EZS] control unit when the rear fog light actuation is active, and then the driver door is opened, the instrument cluster actuates the warning buzzer and issues a corresponding message on the multifunction display. The request to deactivate rear fog light actuation prevents the rear fog light actuation from being activated automatically the next time the vehicle is driven with the low beams switched on.

Additional function requirements for parking brake on reminder warning 

Parking brake warning function sequence 

If the electric parking brake switch (S76/15) is activated at a speed of v > 5 km/h or the electric parking brake controller unit (A13) detects a fault in the system, the instrument cluster actuates the electric parking brake warning light (red) and issues a chime as well as a corresponding message in the multifunction display.

The electric parking brake controller unit reads in the status of the electric parking brake switch and transmits this as well as system fault messages to the instrument cluster via the front end CAN, central gateway control unit and central CAN.

Additional function requirements for speed warning (with code (623) Gulf States version) 

Vehicle speed warning function sequence (with code (623) Arab States of the Gulf version) 

At speeds of v > 120 km/h, the instrument cluster issues a warning by means of:

The instrument cluster calculates the vehicle speed from the wheel speeds that are provided by the ESP control unit (except model 221.095/195) or by the regenerative braking system control unit (on model 221.095/195) via the chassis CAN and forwarded by the central gateway control unit on the central CAN.

Additional function requirements, national seat belt reminder warning 

National seat belt reminder warning function sequence 

If, immediately prior to starting a journey or during a journey, a seat belt is detected to be not fitted, the instrument cluster issues a country-specific optical and acoustic seat belt reminder warning. The instrument cluster reads in the following information in order to issue the country-specific seat belt reminder warning:

On model 216:

On model 221:

The manner of how the seat belt reminder warning is issued differs in whether the seat belt reminder warning is prescribed by law or not and is incorporated into the assessment through the New Car Assessment Program (NCAP).

IMPORTANT NCAP is an assessment program for safety in new vehicles in:

The central gateway control unit passes on this information to the instrument cluster via the central CAN.

Australia

In countries in which the seat belt reminder warning is prescribed by law (extended NCAP), the seat belt warning lamp is activated for a time interval of t = 6 ±2 s. It is irrelevant here whether the driver seat belt is fitted or not.

If the driver is not wearing the seat belt, the instrument cluster also issues an acoustic warning over the internal warning buzzer. For this the instrument cluster evaluates the status of the driver seat belt buckle switch and seat belt reminder warning. The central gateway control unit passes on this information to the instrument cluster via the central CAN.

IMPORTANT If the driver seat belt is fastened during this time interval, the warning tone stops sounding.

An assessment of whether the front passenger seat belt is fitted or not given during this time interval.

Only after the time interval of t = 6 s has expired, does the assessment of both seat belts occur.

In countries in which the seat belt reminder warning is not prescribed by law, the seat belt warning lamp is only actuated during the indicator lamp test.

Immediately after engine running is detected (circuit 61), both the status of the driver seat belt buckle and seat belt reminder warning switch as well as the status of the front passenger seat belt buckle and seat belt reminder warning switch are evaluated. If a seat belt is defined to not be fitted, the instrument cluster actuates the seat belt warning lamp.

If the vehicle starts to move, when it reaches a speed of v > 25 km/h, further successive acoustic warnings are issued. Three or four acoustic warnings are issued in accordance with the seat belt reminder warning. While they are being issued the seat belt warning lamp is actuated at a frequency of f = 1 Hz.

IMPORTANT If during an ignition sequence the driver or front passenger belt buckle is opened a second time, the duration of warning tone phase 1 to 3 is shortened to t = 10 s.

Cancellation of seat belt reminder warning:

Seat belt reminder warning cancellation as of 1.9.09:

If the seat belt reminder warning is active and the vehicle is brought to a standstill (v = 0 km/h) and the vehicle door on the actuating side is opened, the seat belt reminder warning is terminated.

Seat belt reminder warning reactivation:

The seat belt reminder warning for the rear passengers is realized by monitoring the total number of belt tabs inserted into the seat belt buckles in the rear.

As soon as one of the inserted seat belt buckles is opened with the vehicle stationary but without a rear door being opened, a warning message appears in the multifunction display. Opening one of the inserted seat belt buckles while the vehicle is in motion causes a warning message to be displayed in the multifunction display. An acoustic seat belt reminder warning is additionally issued by the warning buzzer.

If the seat belt reminder warning is issued when the vehicle is moving, it is displayed again another t = 30 s when the vehicle is determined to be at rest.

This is contingent on a change in the door status for the left rear door or the right rear door while the vehicle is at a standstill. The seat belt reminder warning, however, does not have an effect on the deployment of the restraint equipment, it only serves as information for the driver.

Additional function requirements for coolant level and coolant temperature warning 

Function sequence for coolant level and coolant temperature warning 

The coolant level in the expansion reservoir is monitored by the coolant level indicator switch (S41).

The status of the coolant level indicator switch is read in by the front SAM control unit. When the coolant level is too low the front SAM control unit transmits a corresponding signal to the instrument cluster via the interior CAN, central gateway control unit and central CAN.

The instrument cluster receives this signal and issues a corresponding message on the multifunction display. The coolant temperature is recorded by the coolant temperature sensor (B11/4). The CDI control unit or the ME-SFI [ME] control unit reads in the coolant temperature sensor signal and transmits the corresponding temperature value on the chassis CAN. The central gateway control unit passes this on to the instrument cluster via the central CAN.

When a coolant temperature of T > 130 °C is reached the instrument cluster actuates the coolant temperature warning lamp (A1e54) and issues a corresponding message via the multifunction display.

Additional function requirements, engine oil level warning 

Engine oil level warning function sequence 

In order to monitor the engine oil level, the oil level check switch (S43) (with engine 156, 272, 273, 276, 278, 642) or the oil sensor (oil level, temperature and quality) (B40) (with engine 157, 275, 629) is installed in the engine oil pan.

While the oil level check switch only identifies if the engine oil level is at the minimum or not, the oil sensor monitors the engine oil level, the engine oil temperature and the engine oil quality.

The signals from the oil level check switch or from the oil sensor are read in by the CDI control unit or the ME-SFI [ME] control unit and sent via the chassis CAN to the central gateway control unit. The ASSYST system integrated in the central gateway control unit evaluates the signals from the oil level check switch or from the oil sensor and, if necessary, requests via the central CAN that an appropriate message be issued in the instrument cluster.

The instrument cluster receives the signal and issues one of the following messages via the multifunction display:

Additional function requirements, preglow indicator (with diesel engine) 

Function sequence, preglow indicator (with diesel engine) 

Preglowing is controlled by the CDI control unit.

For the period in which preglowing is active, the CDI control unit transmits a corresponding signal via the chassis CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives the signal and actuates the preglow indicator lamp (A1e16) accordingly.

Additional function requirements for brake pad wear indicator warning messages 

Function sequence for brake wear indicator warning messages 

The reaching of the wear limit for the front axle brake pads is detected by the right front brake pad contact sensor (S10/2) and the reaching of the wear limit for the rear axle brake pads is detected by the right rear brake pad contact sensor (S10/4).

When the wear limit for the front brake pads is reached, the vehicle ground is switched through to the front SAM control unit via the front brake pad contact sensor.

When the wear limit for the rear brake pads is reached, the vehicle ground is switched through to the rear SAM control unit via the rear brake pad contact sensor.

The respective SAM control unit then transmits a corresponding signal via the interior CAN, central gateway control unit and central CAN to the instrument cluster.

The instrument cluster receives this signal, actuates the brake fluid warning lamp and outputs a corresponding message via the multifunction display.

Additional function requirements for brake fluid level warning messages 

Function sequence for brake fluid level warning messages 

If the fluid level in the brake fluid reservoir is too low it is detected by the brake fluid check switch (S11).

The status of the brake fluid check switch is read in by the front SAM control unit. When the fill level is too low the front SAM control unit transmits a corresponding signal to the instrument cluster via the interior CAN, central gateway control unit and central CAN.

The instrument cluster receives the signal, actuates the brake fluid warning lamp and issues a corresponding message via the multifunction display.

Additional function requirements for windshield washer system fluid level warning messages 

Function sequence for windshield washer system fluid level warning messages 

The fluid level in the washer fluid reservoir is monitored by the windshield washer system fluid level indicator switch (S42).

Additional function requirements for engine-control control/warning messages 

The status of the windshield washer system fluid level indicator switch is read in by the front SAM control unit. When the fill level is too low the front SAM control unit transmits a corresponding signal to the instrument cluster via the interior CAN, central gateway control unit and central CAN. The instrument cluster receives this signal and issues a corresponding message on the multifunction display.

Turn signal confirmation function sequence 

Acoustic feedback about the active turn signal light actuation is realized by the acoustic turn signal indicator integrated into the instrument cluster.

Visual feedback takes place via the left turn signal indicator lamp and right turn signal indicator lamp.

Function sequence for engine-control control/warning messages 

If a fault is present in the injection system, ignition system or exhaust gas system, the ME-SFI control unit transmits a corresponding signal to the instrument cluster via the chassis CAN, central gateway control unit and central CAN. The instrument cluster then actuates the engine diagnosis indicator lamp (A1e58).

Additional function requirements for tank cap warning (with code (494) USA version) 

Function sequence for tank cap warning (with code (494) USA version) 

If the rear SAM control unit identifies an open tank cap, it transmits a corresponding signal via the interior CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives this signal, actuates the fuel reserve warning lamp (A1e4) so that it flashes and issues a corresponding message via the multifunction display.

Function sequence for central locking acoustic feedback (as of 1.9.10) 

The acoustic feedback must be selected and activated in the multifunction display using the left multifunction steering wheel button group and right multifunction steering wheel button group (S111). The status of the acoustic feedback is sent by the instrument cluster via the central CAN to the central gateway control unit and from there to the front SAM control unit via the interior CAN.

Function sequence for ECO start/stop function (with code (B03) ECO start/stop function) 

The ECO start/stop function can be activated or deactivated using a menu in the instrument cluster.

The status of the ECO start/stop function is signaled by the ECO indicator in the multifunction display.

The request for this is sent by the ME-SFI [ME] control unit via the central CAN to the central gateway control unit and from there via the chassis CAN to the instrument cluster.

The ECO indicator can be displayed in two colors:

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic of instrument cluster, control/warning message Model 216 PE54.30-P-2054-97CAA
Model 221 (except model 221.095/195) PE54.30-P-2054-97SAA
Model 221.095/195 PE54.30-P-2054-97SAB
  Component description for instrument cluster A1
Model 221 (except 221.095/195)		 GF54.30-P-6000LE
Model 221.095/195 GF54.30-P-6000LEH
  STH control unit, component description A6n1
With code (228) Stationary heater		 GF83.70-P-4200LE
  Component description for electric parking brake controller unit A13 GF42.20-P-5000LE
  Component description for COMAND controller unit A40/3
With code (526) COMAND with single DVD drive (without navigation) or code (527) COMAND APS with single DVD drive (with navigation system)		 GF82.85-P-3136LE
With code (529) HIGH Class Japan GF82.85-P-3136LEJ
With code (530) COMAND APS USA (with navigation system) GF82.85-P-3136LEU
  Component description for multifunction camera A40/11
On model 221 as of 1.6.09 or model 216 as of 1.9.10 with code (238) Active Lane Keeping Assist or code (476) Automatic lane recognition or code (513) Speed Limit Assist or with code (608) Adaptive Highbeam Assist		 GF54.21-P-3300LE 
  Component description for front reversible emergency tensioning retractor A76, A76/1
Model 221		 GF91.40-P-4020LE
  Component description for intelligent servo module for DIRECT SELECT A80
With transmission 722.6		 GF27.19-P-4020ACS
With transmission 722.9 (except 722.931/950) GF27.19-P-4020AHS
With transmission 722.931 GF27.19-P-4020AHT
With transmission 722.950 GF27.19-P-4020LEH
  DTR controller unit, component description A89 On model 216 up to 31.8.10 with engine 156, 273, 275 and code (219) Distronic (DTR)
Model 221 up to 31.8.10 with engine 156, 272, 273, 275, 642, 629 and code (219) Distronic (DTR)		 GF30.30-P-3210LEA
On model 216 up to 31.8.10 with engine 156, 273, 275 and code (233) DISTRONIC PLUS
Model 221 up to 31.8.10 with engine 156, 272, 273, 275, 642, 629 and code (233) DISTRONIC PLUS		 GF30.30-P-3210LE
On model 216 as of 1.6.09 up to 31.8.10 with engine 156, 273, 275 and code (233) Distronic Plus
Model 221 as of 1.6.09 up to 31.8.10 with engine 156, 272, 273, 275, 642, 629 and code (233) Distronic Plus		 GF30.30-P-3210LEB
On model 221 as of 1.6.09 up to 31.8.10 with engine 156, 272, 273, 275, 629, 642 and code (239) Plus Light adaptive cruise control GF30.30-P-3210LEC
On model 216.3 as of 1.9.10 With code (233) DISTRONIC PLUS with code (237) Active Blind Spot Assist
Model 221 (except 221.095/195) as of 1.9.10 with code (233) DISTRONIC PLUS or with code (237) Active Blind Spot Assist or with code (239) Plus Light adaptive cruise control		 GF30.30-P-3210LED
  Component description for Xenon headlamp control unit E1n1, E2n1
Model 221 up to 31.5.09 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Xenon headlamp unit with asymmetrical integrated curve illumination or
Model 221 as of 1.6.09
Model 216		 GF82.10-P-2114LE
  Component description for restraint systems control unit N2/7 GF91.60-P-4048LE
  Component description for Weight Sensing System (WSS) control unit N2/13 MODEL 221 up to 31.8.08 with CODE (494) USA version GF91.60-P-4046LEU
Component description for ME-SFI [ME] control unit With engine 275 GF07.61-P-6000MOS
On model 221 with engine 276 GF07.61-P-6000MMB
  Component description for front SAM control unit with fuse and relay module N10/1 GF54.21-P-6070LE 
  Component description for rear SAM control unit with fuse and relay module N10/2 GF54.21-P-6030LE 
  Component description for trailer recognition control unit N28/1
For model 221 with code (550) Trailer hitch		 GF31.19-P-4050LE
  Component description for regenerative braking system control unit N30/6
On model 221.095/195		 GF42.22-P-1100LEH
  Left front seat control unit, component description N32/1 GF91.29-P-5230LE
  Right front seat control unit, component description N32/2 GF91.29-P-5240LE
  Component description for ESP control unit N47-5
Model 216.3, 221 (except 221.095/195)		 GF42.45-P-5118LE
  AIRmatic with ADS control unit, component description N51
On model 221 up to 31.5.09 without code (487) Active Body Control (ABC), Model 221.1 with code (Z07) Highest protection, Model 216.3 up to 31.5.09 with code (489) AIRmatic (air suspension with continuous damper adjustment)		 GF32.22-P-5108LE
On model 221 as of 1.6.09 without code (487) Active Body Control (ABC) and without code (Z07) Highest protection, on model 216.3 as of 1.6.09 with code (489) AIRmatic (air suspension with continuous damper adjustment)) GF32.22-P-5108LEA
  ABC control unit, component description N51/2
On model 221 with code (487) Active Body Control (ABC), on model 216.3 without code (489) AIRmatic (air suspension with continuous damper adjustment)		 GF32.50-P-4501LE
  Component description for PARKTRONIC control unit N62
On model 221 up to 31.5.09 with code (220) PARKTRONIC, on model 216 up to 31.8.10		 GF54.65-P-5001LE
On model 221 as of 1.6.09 with code (220) PARKTRONIC or code (230) Exclusive parking assist on model 216 as of 1.9.10 with code (220) PARKTRONIC or code (230) Exclusive parking assist GF54.65-P-5001LEA
  Component description for radar sensors control unit N62/1
Up to 31.8.10 with code (233) DISTRONIC PLUS		 GF30.30-P-3301LE
Up to 31.8.10 with code (234) Blind Spot Assist,
on model 221 (except 221.095/195) as of 1.9.10 with code (239) Plus Light adaptive cruise control, on model 221.095/195 as of 1.9.10 with code (234) Blind Spot Assist		 GF30.30-P-3301LEB
Model 221 up to 31.8.10 with code (239) Plus Light adaptive cruise control GF30.30-P-3301LEC
  Video and radar sensor system control unit, component description N62/2
On model 216.3, 221 (except 221.095 /195) as of 1.9.10
with code (233) DISTRONIC PLUS
with code (237) Active Blind Spot Assist
with code (238) Active Lane Keeping Assist		 GF30.30-P-3304LE
  Component description for left door control unit N69/1
Model 216		 GF72.29-P-4124LA
  Component description for right door control unit N69/2 Model
216		 GF72.29-P-4128LA
  Rear door control unit, component description N69/3, N69/4
On model 221		 GF72.29-P-6020LE
  Component description for Keyless-Go control unit N69/5
With CODE (889) Keyless Go		 GF80.61-P-4204LE
  Upper control panel control unit, component description N72/1 GF54.21-P-6040LE 
  EZS control unit, component description N73 GF80.57-P-6003LE
  Component description for steering column tube module N80 GF54.21-P-6050LE 
  Component description for battery management system control unit N82/2
On model 221.095/195		 GF54.10-P-3012MEH
  Component description for TPM [RDK] control unit N88
For code (494) USA version or code (475) Tire pressure monitor (Premium), Siemens up to 31.5.09		 GF40.15-P-5123LE
With code (475) Tire pressure monitor (Premium), Schrader As of 1.6.09 GF40.15-P-5123LEA
  Component description for central gateway control unit N93 GF54.21-P-4170LE 
  Night View Assist control unit, component description N101
with code (610) Night View Assist		 GF54.30-P-6200LE
  Component description for Weight Sensing System (WSS) control unit N110
MODEL 221 as of 1.9.08 with CODE (494) USA version
Model 216 with code (494) USA version		 GF91.60-P-4069LAU
  Component description for emergency call system control unit N123/4
With code (359) TELE AID emergency call system		 GF82.95-P-3212LEU
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