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

MODEL 218 

Location 

The rear SAM control unit is located at the right rear in the trunk.

Task 

The rear SAM control unit has the following tasks:

• Reading in of sensors 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 

Reading in of sensors and signals 

The input factors are read in over the following connections:

• Direct line 
• LIN 
• Interior CAN (CAN B) 

Direct line 

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

• Left rear door rotary tumbler switch (A85/3s1)
• Right rear door rotary tumbler switch (A85/4s1)
• Left fuel tank fill level indicator sensor (B4/1)
• Right fuel tank fuel level indicator fill level sensor (B4/2)
• Trunk lid/liftgate rotary tumbler switch (M14/7s1)
• Tank cap central locking actuator (M14/10)
• Trunk lid/liftgate lock element (M14/31) (for model 218.9)
• Hall sensors in rear window roller sun blind motor (M24) (for model 218.3 with code 540 (Electric roller sun blind for rear window))
• Hall sensor for left load compartment cover (M50/1b1) (for model 218.9)
• Seat adjustment motor for left rear head restraint (M53/1)
• Seat adjustment motor for right rear head restraint (M53/2)
• Right front seat ventilation blower regulator (N29/6) (with code 401 (Seat climate control for driver and front passenger))
• Left front seat ventilation blower regulator (N29/5) (with code 401 (Seat climate control for driver and front passenger))
• Liftgate inside door handle (S15/2) (for model 218.9)
• Left rear backrest inclination switch (S54/5) (for model 218.3 with code 287 (Folding rear seat backrest) or model 218.9)
• Right rear backrest inclination switch (S54/6) (for model 218.3 with code 287 (Folding rear seat backrest) or model 218.9)
• Left rear backrest lock switch (S54/7) (for model 218.3 with code 287 (Folding rear seat backrest) or model 218.9)
• Right rear backrest lock switch (S54/8) (for model 218.3 with code 287 (Folding rear seat backrest) or model 218.9)
• KEYLESS-GO trunk lid/liftgate button (S62/21) (with code 889 (KEYLESS-GO))
• Trunk lid/liftgate control button (S62/36) (for model 218.3 with code 881 (Remote trunk closing), model 218.9)
• Left engine hood contact switch (S62/43) (with code 551 (Anti-theft alarm system (ATA)) or with code B03 (ECO start/stop function))
• Left rear seat belt buckle switch (S68/5)
• Right rear seat belt buckle switch (S68/6)
• Trunk lid/liftgate contact switch (S88/6) (with code 887 (Valet Parking))
• Trunk lid/liftgate external operation switch (S88/8)
• Trunk lid emergency opening switch (S88/10) (for model 218.3 with code 494 (USA version))

LIN 

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

• Battery sensor (B95) (via on-board electrical system LIN (LIN B7))
• Alarm siren (H3/1) (with code 882 (Interior monitoring)) (over rear SAM-LIN (LIN B4))
• Interior protection and tow-away protection control unit (N26/6) (with code 882 (Interior monitoring)) (over rear SAM-LIN (LIN B4))

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 microprocessor and the corresponding components are actuated.

Controlling functions 

The rear SAM control unit controls the following functions:

• Battery state recognition
• Exterior lights in rear end
• Heated rear window
• Central locking in rear area
• Seat heater (with code 873 (Seat heater for driver and front passenger) or with code 401 (Seat climate control for driver and front passenger))
• Electric seat ventilation (with code 401 (Seat climate control for driver and front passenger))
• Anti-theft alarm system (ATA [EDW]) (with CODE 551 (Anti-theft alarm system (ATA [EDW])))
• Trunk lid/liftgate control (for model 218.3 with code 881 (Remote trunk closing) or model 218.9)

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)
• Rear fog lamp (E3/6) (without code 460 (Canada version) and without code 494 (USA version))
• Right rear lamp unit (E4)
• Right trunk lamp (E18/4)
• Left trunk lamp (E185)
• Left license plate lamp (E19/1)
• Right license plate lamp (E19/2)
• Center brake lamp (E21)
• Trunk lid/liftgate ambient lamp (E40)
• Liftgate wiper motor (M6/4) (on model 218.9)
• Trunk lid/liftgate central locking motor (M14/7)
• Tank cap central locking actuator (M14/10)
• Left front seat cushion seat ventilation motors (M18/9) (with code 401 (Seat climate control for driver and front passenger))
• Left front backrest seat ventilation motors (M18/10) (with code 401 (Seat climate control for driver and front passenger))
• Right front seat cushion seat ventilation motors (M18/11) (with code 401 (Seat climate control for driver and front passenger))
• Right front backrest seat ventilation motors (M18/12) (with code 401 (Seat climate control for driver and front passenger))
• Seat adjustment motor for left rear head restraint (M53/1)
• Seat adjustment motor for right rear head restraint (M53/2)
• Rear window heater (R1)
• Left front seat cushion heater pad (R13/1) (with code 873 (Seat heater for driver and front passenger))
• Left front backrest heater pad (R13/2) (with code 873 (Seat heater for driver and front passenger))
• Right front seat cushion heater pad (R13/3) (with code 873 (Seat heater for driver and front passenger))
• Right front seat backrest heater pad (R13/4) (with CODE 873 (Seat heater for driver and front passenger))
• Switch illumination for trunk lid emergency opening switch (S88/10) (for model 218.3 with code 494 (USA version))

LIN 

The alarm siren (with code 882 (Interior monitoring)) is actuated over the rear SAM-LIN.

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 218 Sheet 1 Model 218 Sheet 2 Model 218 Sheet 3 Model 218 Sheet 4 Model 218 Sheet 5 Model 218 Sheet 6 Model 218 Sheet 7 Model 218 Sheet 8

PE54.21-P-2108-97XAA PE54.21-P-2108-97XAB PE54.21-P-2108-97XAC PE54.21-P-2108-97XAD PE54.21-P-2108-97XAE PE54.21-P-2108-97XAF PE54.21-P-2108-97XAG PE54.21-P-2108-97XAH