Component Description For Rear SAM Control Unit With Fuse And Relay Module - GF54.21-P-6030CE

MODEL 204.0/2 as of model year 2009

MODEL 204.3

MODEL 204.9

Model 204.0/2/3 shown on model 204.0

Fig 1: Identifying Rear Sam Control Unit With Fuse And Relay Module - Shown On Model 204.0

Location

The rear SAM control unit is located in the rear right of the luggage compartment.

Model 204.9

Fig 2: Identifying Rear Sam Control Unit With Fuse And Relay Module - Shown On Model 204.9

Location

The rear SAM control unit is located on the front crossmember in the trunk.

Task

The rear SAM control unit has the following tasks:

Reading in of sensors, pickups and signals
Evaluation of input factors
Controlling functions
Actuation of components

The fuse and relay module of the rear SAM control unit supplies various systems and control units with power through limit switches to match the function sequence.

The following tasks are the responsibility of the fuse and relay module:

Voltage supply to components
Power supply and relay switching
Switching consumers using relays

Detailed information is available in the "Fuse and relay box, as-built configuration" function description.

Reading in of sensors, pickups and signals

The input factors are read in via the following connections:

Direct line
Local Interconnect Network (LIN)
Interior CAN (CAN B)

Direct line

The signals from the following components are read via direct lines:

FM, AM and CL antenna amplifier (A2/18) (model 204.0/3)
Rear window antenna amplifier 1 (A2/71) (model 204.2/9)
Left rear door rotary tumbler switch (A85/3s1) (on model 204.0/2/9)
Right rear door rotary tumbler switch (A85/4s1) (on model 204.0/2/9)
Left fuel level indicator sensor (B4/1)
Right fuel level indicator sensor (B4/2)
Trunk lid rotary tumbler switch (M14/7s1) (model 204.0/3)
Liftgate rotary tumbler switch (M14/7s1) (model 204.2/9)
Tank cap central locking motor (M14/10)
On model 204.0/3 with code (287) Through-loading feature, model 204.2/9:
- Left rear backrest inclination switch (S54/5)
- Right rear backrest inclination switch (S54/6)
- Left rear backrest lock switch (S54/7)
- Right rear backrest lock switch (S54/8)
With code (551) Antitheft alarm system (ATA [EDW]):
- Pedestrian protection Hall sensor + engine hood ATA switch (A38/1) (on model 204.3 with code (U60) Pedestrian protection)
- Left engine hood contact switch (S62/43) (without code (U60) Pedestrian protection)
with code (889) Keyless-Go:
- KEYLESS-GO trunk lid button (S62/21) (model 204.0/3)
- KEYLESS-GO liftgate button (S62/21) (model 204.2/9)
On model 204.2/9 with code (890) EASY-PACK liftgate:
- Liftgate control button (S62/36)
Left rear seat belt buckle switch (S68/5)
Right rear seat belt buckle switch (S68/6)
Center rear seat belt buckle switch (S68/14)
On model 204.0/3 with code (887) Valet Parking:
- Trunk lid contact switch (S88/6)
On model 204.0/3 with code (494) USA version:
- Trunk lid emergency opening switch (S88/10)
Trunk lid external operation switch (S88/8) (model 204.0/3)
Liftgate external operation switch (S88/8) (model 204.2/9)
On model 204.3 with code (275) Memory package (driver seat, steering column, mirrors) or code (242) Electrically adjustable front passenger seat with memory:
- EASY ENTRY system limit switch, driver seat (S159/3)
- EASY ENTRY system limit switch, front passenger seat (S159/4)

LIN

The signals from the following components are read in via LIN:

On-board electrical system LIN (LIN B7):
- Battery sensor (B95)
Rear SAM LIN (LIN B4):
- Alarm siren (H3/1) (up to 31.5.10 with code (551) Antitheft alarm system (ATA), as of 1.6.10 with code (551) Antitheft alarm system (ATA) and without code (494) USA version)
- Interior protection and tow-away protection control unit (N26/6) (with code (882) Interior monitoring (only with ATA))

Interior CAN

The signals are read in by the rear SAM control unit over the interior CAN.

The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).

Evaluation of input factors

The input factors are evaluated by the integrated microprocessor and the relevant systems or components are then actuated.

Controlling functions

The rear SAM control unit controls the following functions:

On-board electrical system management
Exterior lights (ABL) for vehicle rear
Heated rear window
Trunk lid lock (model 204.0/3), liftgate (model 204.2/9) and fuel filler door
Heated seats (HS) (with code (873) front left and right heated seats)
Electric rear window roller blind (on model 204.0 with code (540) Roller sun blind)
Antitheft alarm system (ATA [EDW]) (with code (551) Antitheft alarm system (ATA [EDW]))

Actuation of components

The actuation of the components takes place via the following connections:

Direct line
LIN
Interior CAN

Direct line

The following components are actuated via direct lines:

Left rear lamp unit (E3)
Right rear lamp unit (E4)
Model 204.0/2., model 204.9 with code (460) Canada version or code (494) USA version:
- Left rear side-marker lamp (E6/3)
- Right rear side-marker lamp (E6/4)
Right luggage compartment lamp (E18/4)
Left trunk lamp (E18/5) (model 204.2)
Left license plate lamp (E19/1)
Right license plate lamp (E19/2)
Center brake lamp (E21)
Ambient lamp and left trunk lid warning lamp (E40/2) (model 204.0/3)
Ambient lamp and left liftgate warning lamp (E40/2) (model 204.2/9)
Ambient lamp and right liftgate warning lamp (E40/3) (model 204.2)
Liftgate wiper motor (M6/4) (on model 204.2/9)
Trunk lid central locking motor (M14/7) (model 204.0/3)
Liftgate central locking motor (M14/7) (model 204.2/9)
Tank cap central locking motor (M14/10)
On model 204.0 with code (540) Roller sun blind:
- Roller sun blind motor for rear window (M24)
With code (409) Left/right front multicontour seats
- Multicontour seat pneumatic pump (M40)
With code (494) USA version:
- Trunk lid emergency opening switch
Rear window heater (R1)
With code (873) Heated seats, left and right front seat:
- Left front seat sitting surface heated cushion (R13/1)
- Left front backrest heated cushion (R13/2)
- Right front seat sitting surface heated cushion (R13/3)
- Right front backrest heated cushion (R13/4)

LIN

The following component is actuated via the rear SAM-LIN:

Alarm siren (up to 31.5.10 and as of 1.6.10 with code (551) Antitheft alarm system (ATA [EDW]) and without code (494) USA version)

Interior CAN

The signals are sent over the interior CAN by the rear SAM control unit.

The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).

Wiring diagram for rear SAM control unit with fuse and relay module (N10/2)	MODEL 204.0/2 as of model year 2009Sheet 1MODEL 204.3Sheet 1MODEL 204.9Sheet 1	PE54.21-P-2108-97FAA
	MODEL 204.0/2 as of model year 2009Sheet 2MODEL 204.3Sheet 2MODEL 204.9Sheet 2	PE54.21-P-2108-97FAB
	MODEL 204.0/2 as of model year 2009Sheet 3MODEL 204.3Sheet 3MODEL 204.9Sheet 3	PE54.21-P-2108-97FAC
	MODEL 204.0/2 as of model year 2009Sheet 4MODEL 204.3Sheet 4MODEL 204.9Sheet 4	PE54.21-P-2108-97FAD
	MODEL 204.0/2 as of model year 2009Sheet 5MODEL 204.3Sheet 5MODEL 204.9Sheet 5	PE54.21-P-2108-97FAE
	MODEL 204.0/2 as of model year 2009Sheet 6MODEL 204.3Sheet 6MODEL 204.9Sheet 6	PE54.21-P-2108-97FAF
	MODEL 204.0/2 as of model year 2009Sheet 7MODEL 204.3Sheet 7MODEL 204.9Sheet 7	PE54.21-P-2108-97FAG
	MODEL 204.0/2 as of model year 2009Sheet 8MODEL 204.3Sheet 8MODEL 204.9Sheet 8	PE54.21-P-2108-97FAH