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

MODEL 216.3, 221.0 /1 as of model year 2009 /CY 08 

Shown on model 221.0 

Location 

The rear SAM control unit is located in the luggage compartment, on the partition wall to the passenger compartment.

Task 

The rear SAM control unit has the following tasks:

• Reading in of sensors, pickups and signals 
• Evaluation of input factors 
• Control of systems 
• Actuating components 
• Voltage supply to components 
• Switching consumers using relays 

Reading in of sensors, pickups and signals 

The input factors are read in with the following connections:

• Direct line 
• Interior CAN (CAN B) 

Direct line 

The signals from the following components are read via direct lines: Fuel level sensor, left half of tank (B4/1) Fuel level sensor, right half of tank (B4/2)

• Trunk lid gearing microswitch 2 (M14/7s1)
• Trunk lid lock pawl microswitch (M14/7s2)
• Rear roller blind motor Hall sensors (M24) (with code (540) Electric rear window roller blind)
• Right rear brake pad contact sensor (S10/4)
• ATA [EDW] engine hood switch (S62)

  (with code (551) Antitheft alarm system (ATA [EDW])

• Left rear seat belt buckle switch (S68/11) (model 221, model 216 with code (435) Folding head restraints in rear compartment)
• Right rear seat belt buckle switch (S68/12) (model 221, model 216 with code (435) Folding head restraints in rear compartment)
• Center rear seat belt buckle switch (S68/14) (model 221 without code (223) Rear bench seat with electrically adjustable outer seats with PRE-SAFE positioning function for outer seats and outer head restraints)
• Trunk lid contact switch (S88/6) (with code (494) USA version)
• Trunk lid external operation switch (S88/8)
• Trunk lid emergency release switch (S88/10)) (for code (494) USA version)

Interior CAN 

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

The functions resulting therefrom are described in the corresponding 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.

Control of systems 

The rear SAM control unit controls the following systems:

• Rear exterior lights (ABL)
• Trunk illumination
• Rear window defroster
• Antitheft alarm system (ATA [EDW]) (with code (551) Antitheft alarm system (ATA [EDW]))
• Rear roller blind (with code (540) Electric rear window roller blind)
• Rear seat head restraints
• Central locking (ZV) of tank cap and trunk lid with integrated power closing

Component actuation 

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

• Direct line 
• Rear SAM LIN (LIN B4) 

Direct line 

The following components are actuated via direct lines:

• Left taillights (E3)
• Right taillights (E4)
• Right luggage compartment lamp (E18/4)
• Left luggage compartment lamp (E18/5)
• Left license plate lamp (E19/1)
• Right license plate lamp (E19/2)
• Center high-mounted stop lamp (E21)
• Left trunk lid ambient and warning lamp (E40/2)
• Right trunk lid ambient and warning lamp (E40/3)
• Trunk lid central locking motor (M14/7)
• Fuel filler flap CL [ZV] motor (M14/10)
• Rear roller blind motor

  (with code (540) Electric rear window roller blind)

• Lumbar pump (M25/1) (without code (409) Left/right front multicontour seats and without code (432) Left and right dynamic multicontour seat)
• Pneumatic pump for dynamic seat control (M40/1)

  (with code (432) Left and right dynamic multicontour seat)

• Rear head restraints valve block (Y24/11)

Rear SAM LIN 

The following components are actuated through the rear SAM LIN:

• ATA [EDW] inclination sensor (B27)

  (with code (551) Anti-theft alarm system (ATA [EDW]))

• Alarm signal siren (H3/1)

  (with code (551) Antitheft alarm system (ATA [EDW]))

Voltage supply to components 

Limit switches supply power to various components and control units to match the function sequence.

Requests are notified to the rear SAM control unit over either the interior CAN or directly scanned switches, transmitters and sensors. Fuses are used to protect the components and control units that have voltage applied to them against overloading.

Detailed information is available in the fuse and relay box, as-built configuration specification.

Switching consumers using relays 

The rear SAM control unit acts as a support for the following relays over which various consumers are actuated:

• Terminal 15 relay (N10/2kM)
• Terminal 15R relay (N10/2kN)
• Power outlet relay (N10/2kO)
• Heated rear window relay (N10/2kP)
• Circulation pump relay (N10/2kQ) (with engine 275) or
• Power electronics circulation pump 1 relay (K108) (with model 221.095/195)
• Cigar lighter relay (N10/2kR)
• Fuel pump relay (N10/2kS) (except model 221.095/195) or Power electronics circulation pump 2 relay (K108/1) (with model 221.095/195)

The circulation pump relay (with engine 275), power electronics circulation pump 1 relay (with model 221.095/195), power electronics circulation pump 2 relay (with model 221.095/195) and the fuel pump relay (except model 221.095/195) are indeed located on the rear SAM control unit, but are not actuated by it.

The circulation pump relay (with engine 275) or power electronics circulation pump 1 relay (with model 221.095/195) is actuated by the front SAM control unit with fuse and relay module (N10/1).

The power electronics circulation pump 2 relay (with model 221.095/195) is powered by the front SAM control unit through the circuit 87 connector sleeve (Z7/5), and the ME-SFI [ME] control unit (N3/10) is responsible for its actuation.

The fuel pump relay is powered by the front SAM control unit through the circuit 15 connector sleeve (Z3), and the CDI control unit (N3/9) is responsible for its actuation.

	Wiring diagram / rear SAM control unit with fuse and relay module (N10/2)	Model 216 Sheet 1	PE54.21-P-2108-97CAA
		Model 216 Sheet 2	PE54.21-P-2108-97CAB
		Model 216 Sheet 3	PE54.21-P-2108-97CAC
		Model 221 Sheet 1	PE54.21-P-2108-97SAA
		Model 221 Sheet 2	PE54.21-P-2108-97SAB
		Model 221 Sheet 3	PE54.21-P-2108-97SAC