Rear SAM control unit, component description - GF54.21-P-7030GZ

MODEL 164 up to Model Year 8

Shown on model series 164.1

Fig 1: Identifying Rear SAM Control Unit Component

Courtesy of MERCEDES-BENZ USA

Location

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

General

The rear SAM control unit serves to exchange data and is connected to the Controller Area Network bus Class B (interior) (CAN-B).

Task

The rear SAM control unit reads in the following components, sensors, pick-ups and switches, and actuates the function and switch and controls illumination and then actuates the following relay and consumers by way of semiconductor switches.

Controlling

Heated rear window (R1)
Rear exterior lights
Turn signal functions
Right rear door central locking system
Central locking, rear-end door
Rear-end door power closing
Trunk illumination
Trailer recognition and trailer illumination
Rear wiper
Left and right rear door illumination
Left and right rear vent window
Anti-theft alarm system [EDW] (for anti-theft alarm system (ATA [EDW]), code 551)

Reading in and outputting the following signals:

Circuit 30
Circuit 31
Circuit 15
Circuit 54

Reading in following switches, pickups and sensors:

Rear door locking unit (A72)
Fuel level sensor, left half of tank (B4/1)
Fuel level sensor, right half of tank (B4/2)
Left vent window obstruction sensor strip (B51/5)
Right vent window obstruction sensor strip (B51/6)
Right front door rotary tumbler microswitch (M14/5s1)
Left front door rotary tumbler microswitch (M14/6s1)
Left rear door rotary tumbler microswitch (M14/8s1)
Right rear door rotary tumbler microswitch (M14/9s1)
Spare tire carrier "locked" switch (S151/1)
Spare tire carrier "open" switch (S151/2)
Right easy entry feature microswitch, 2nd seat row (S159/1)
Stop light switch (S9/1)
Engine hood ATA switch (S62)
Rear-end door handle switch (S88/9)
Interference filter 1 (A49/1)
Alarm signal horn with additional battery (H3/1) (with anti-theft alarm system (ATA [EDW]), code 551)

Switching in the following relays:

Socket circuit 15R relay (with run-on) (F4kK)
Heated rear window relay (F4kM)
Rear wiper relay (F4kP)
Trailer circuit 30X relay (F4kL)
Circuit 15R relay (F4kR)
Front passenger seat adjustment comfort relay (K24/2)

The fuel pump relay (F4kO) is located on the load compartment fuse and relay box (F4), but it is actuated by the ME-SFI [ME] control unit (N3/10).

Switching consumers via semiconductor switches

Rear door locking unit
Left taillamp (E3)
Left turn signal lamp (E3e1)
Taillamp and left rear fog lamp (E3e2)
Left backup lamp (E3e3)
Left stop lamp (E3e4)
Right taillamp (E4)
Right turn signal lamp (E4e1)
Taillamp and right rear fog lamp (E4e2)
Right backup lamp (E4e3)
Right stop lamp (E4e4)
Right luggage compartment lamp (E18/4)
Left luggage compartment lamp (E18/5)
Left rear-end door license plate lamp (E19/3)
Right rear-end door license plate lamp (E19/4)
Center high-mounted stop lamp (E21)
Alarm signal horn with additional battery (for anti-theft alarm system (ATA [EDW]), code 551)
Right rear door CL [ZV] motor (M14/9)
fuel filler flap CL [ZV] motor (M14/10)
Central locking motor, spare tire carrier (M14/13)
Left vent window motor (M21/8)
Right vent window motor (M21/9)
Lumbar pump (M25/1)
Overall trailer lighting

For USA version, code 494:

Alarm horn (H3)