Rear SAM control unit with fuse and relay module, component description - GF54.21-P-6030CE

WARNING: This page is about a different car, the 2011 Mercedes-Benz C300, 2010 Mercedes-Benz C300, 2009 Mercedes-Benz C300, and 2008 Mercedes-Benz C300. However, it is still accessible from the selected car via links, so may be relevant.

MODEL 204.0 /2 as of model year 2009 /YoM 08

Model 204.0/2/3, shown on model 204.0

Fig 1: Locating Rear SAM Control Unit With Fuse And Relay Module

Courtesy of MERCEDES-BENZ USA

Location

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

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 a direct line:

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) (with model 204.0/2/9)
Right rear door rotary tumbler switch (A85/4s1) (with 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)
With 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 seat 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) (with 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)
- Liftgate KEYLESS-GO button (S62/21) (model 204.2/9)
In 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)
- With model 204.0/3 with code (887) Valet Parking:
  - Trunk lid contact switch (S88/6)
- With 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)
- 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 [EDW]), as of 1.6.10 with code (551) Antitheft alarm system (ATA [EDW]) 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:
- Battery state recognition
- Exterior lights (ABL) for vehicle rear
- Rear window defroster
- 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 (with 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 a direct line:
- 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)
- Trunk lid central locking motor (M14/7) (model 204.0/3)
- 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
  - Pneumatic pump for MKS (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 heater pad (R13/1)
  - Left front backrest heater pad (R13/2)
  - Right front seat sitting surface heater pad (R13/3)
  - Right front backrest heater pad (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)	Sheet 1	PE54.21-P-2108-97FAA
	Sheet 2	PE54.21-P-2108-97FAB
	Sheet 3	PE54.21-P-2108-97FAC
	Sheet 4	PE54.21-P-2108-97FAD
	Sheet 5	PE54.21-P-2108-97FAE
	Sheet 6	PE54.21-P-2108-97FAF
	Sheet 7	PE54.21-P-2108-97FAG
	Sheet 8	PE54.21-P-2108-97FAH