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Trip computer, function - GF54.30-P-3044LE

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).

Trip computer (TRIP) function, general 

The trip computer provides data and information on average fuel consumption, trip time, average speed, travel distance and remaining range. The information is shown in the multifunction display (A1p13) in the instrument cluster.

The trip computer provides the following display screens:

The information displayed refers to the point in time of the last reset of the short-distance memory "After start" or of the long-distance memory "After reset".

The following content can be shown on the trip computer:

The corresponding display screen can be selected by scrolling with the scroll forward and back button (S110s1) and then selecting with the system selection button (S110s3).

The steering column tube module (N80) reads in the corresponding selection via the steering LIN (LIN E1) and transmits this to the instrument cluster via the interior CAN (CAN B), central gateway control unit and central CAN.

The trip computer function is made up of the following component functions:

Display of travel distance function sequence 

The travel distance is calculated in the instrument cluster from the wheel speeds.

The wheel speeds are recorded by the following components:

The ESP control unit (N47-5) (except model 221.095/195) or the regenerative braking system control unit (N30/6) (with model 221.095/195) reads in the signals from the rpm sensors and sends them to the instrument cluster via the chassis CAN, central gateway control unit and central CAN. The instrument cluster receives the signals from the rpm sensors and uses them to calculate the travel distance.

The travel distance "After start" is displayed in a range of 0 to 9999 km. An automatic reset is performed following a travel distance "After start" overflow.

IMPORTANT If a period of more than t = 4 h lies between the time when circuit 15 is switched off and then switched on again, then the "After start" odometer is automatically reset to 0.

The "AFTER RESET" travel distance display is shown in a range of 0 to 99, 999 km. An automatic reset takes place at a value of the travel distance "After reset" of more than 100.000 km. Depending on the setting in the instrument cluster and the national version code, the travel distance is displayed in:

IMPORTANT When changing over from kilometers to miles a changeover from liters to gallons also takes place automatically.

Function sequence for the time display 

With circuit 15 ON, a time counter in the instrument cluster adds up the time "After start" or "After reset". The display ranges from 0 to 999 h and 59 min.

The time "After reset" is determined analog to determining the time "After start", though here the display takes place in a range of 0 to 9999 h and 59 min.

Function sequence for the average speed display 

The trip computer calculates the average speed from the ratio between the travel distance driven and the time passed (trip time) since the last reset of the short-distance memory or long-distance memory. Depending on the setting (kilometers/miles) and national version code, the average speed display is shown in:

Function sequence for displaying average and present consumption 

The trip computer calculates the fuel consumption using the following information:

Depending on the unit setting (kilometers/miles) and the national variant coding of the instrument cluster the fuel consumption is displayed in:

The CDI control unit or the ME-SFI [ME] control unit transmits the relevant information over the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

Bar graph display of present consumption (as of 1.6.09):

The following static displays are possible in the multifunction display:

Function sequence for remaining distance display 

The trip computer determines the expected range from the ratio between the current tank capacity and the average fuel consumption. The current tank contents are recorded by the fuel level sensor, left tank half (B4/1) and fuel level sensor, right tank half (B4/2). The rear SAM control unit with fuse and relay module (N10/2) reads in the signals from the fuel level indicator sensors and transmits them via the interior CAN, central gateway control unit and central CAN to the instrument cluster. The average fuel consumption is gathered from the short-distance memory or long-distance memory.

Function sequence for reset display 

The trip computer is reset by pressing the OK button (S110s6) in the left multifunction steering wheel button group (S110). Only the currently displayed information is reset.

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic, instrument cluster trip computer Model 216 PE54.30-P-2057-97CAA
Model 221 (except model 221.095/195) PE54.30-P-2057-97SAA
Model 221.095/195 PE54.30-P-2057-97SAB
  Component description for instrument cluster A1
Model 216.3, model 221 (except 221.095/195)		 GF54.30-P-6000LE
Model 221.095/195 GF54.30-P-6000LEH
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 rear SAM control unit with fuse and relay module N10/2 GF54.21-P-6030LE 
  Component description for regenerative braking system control unit N30/6
On model 221.095/195		 GF42.22-P-1100LEH
  Component description for ESP control unit N47-5
Model 216.3, 221 (except 221.095/195)		 GF42.45-P-5118LE
  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 central gateway control unit N93 GF54.21-P-4170LE 
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