Component description for front SAM control unit - GF54.21-P-7010RF

Model 205, 253

Show on model 205

Fig 1: Identifying Front SAM Control Unit - Shown On Model 205

Courtesy of MERCEDES-BENZ USA

Location

The front SAM control unit is located at the left front on the A-pillar.

Task

The front SAM control unit has the following tasks:

Reading in of sensors and signals
Evaluation of input factors
Controlling functions
Actuation of components
Switching of relays

Reading in of sensors and signals

The input factors are read in via the following connections:

Direct line
Instrument panel LIN (LIN 1)
Roof LIN (LIN B13)
Battery sensor-LIN (LIN B15)
Rain/light sensor LIN (LIN B16)
Interior CAN (CAN B)

Direct line

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

Outside temperature sensor (B14)
CDI control unit (N3/9) (diesel engine)
ME-SFI [ME] control unit (N3/10) (gasoline engine)
Electric steering lock control unit (N26/5) (transmission 716)
Hazard warning system button (N72/1s57)
Exterior lights switch (S1)
Instrument illumination brightness control (S1r1)
Right front brake wear sensor (S10/2)
Brake fluid level switch (S11)
Coolant level switch (S41)
Windshield washer system washer fluid level switch (S42)
Right engine hood contact switch (S62/42)
Left engine hood contact switch (S62/43)
Switch for separate trunk lid lock (S88/6) (model 205.0/1 with CODE 887 (Separate trunk lid lock))

Instrument panel LIN

The signals from the following components are read-in over the instrument panel LIN:

Driver-side instrument panel button group (S6/1) (with CODE 235 (Active Parking Assist), CODE 238 (Active Lane Keeping Assist), CODE 266 (DISTRONIC PLUS with Steer Assist and Stop & Go Pilot), CODE 463 (Head-up display) and CODE 501 (360° camera))
Analog clock (A70/1)

Roof LIN

The signals of the following components are read-in over the roof LIN:

Overhead control panel control unit (N70)
Garage door opener (A67n2) (with CODE 232 (Garage door opener))

Battery sensor LIN

The battery sensor (B95) signals are read in over the battery sensor-LIN.

Rain and light sensor LIN

The signals from the following components are read in over the rain/light sensor LIN:

Rain/light sensor with additional functions (B38/2)
Wiper motor (M6/1)

Interior CAN

The signals are read in by the front SAM control unit via 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 that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Controlling functions

The front SAM control unit also controls the following functions:

Energy management
Exterior lights
Interior illumination
Windshield wiper system

Actuation of components

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

Direct line
Instrument panel LIN
Roof LIN
Interior CAN

Direct line

The following components are actuated via direct lines:

Left front lamp unit (E1):
- Left high beam (E1e1) (except CODE (631) Static left-hand traffic LED headlamp, except CODE (632) Static right-hand traffic LED headlamp, except CODE (640) High Performance LED, except CODE (641) DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP and except CODE (642) DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP)
- Left low beam (E1e2) (except CODE (631) Static left-hand traffic LED headlamp, except CODE (632) Static right-hand traffic LED headlamp, except CODE (640) High Performance LED, except CODE (641) DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP and except CODE (642) DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP)
- Left turn signal light (E1e5) (except CODE (631) Static left-hand traffic LED headlamp, except CODE (632) Static right-hand traffic LED headlamp, except CODE (640) High Performance LED, except CODE (641) DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP and except CODE (642) DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP)
- Left front side marker lamp (E1e6) (with CODE 494 (USA version) or CODE 460 (Canada version) and except CODE 640 (High Performance LED), except CODE 641 (DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP) and except CODE 642 (DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP))
- Left parking light, standing light and daytime running lamp (E1e13) (except CODE 631 (Static left-hand traffic LED headlamp), except CODE 632 (Static right-hand traffic LED headlamp), except CODE 640 (High Performance LED), except CODE 641 (STATIC LEFT-HAND TRAFFIC LED HEADLAMP) and except CODE 642 (STATIC RIGHT-HAND TRAFFIC LED HEADLAMP))
Right front lamp unit (E2):
- Right high beam (E2e1) (except CODE (631) Static left-hand traffic LED headlamp, except CODE (632) Static right-hand traffic LED headlamp, except CODE (640) High Performance LED, except CODE (641) DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP and except CODE (642) DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP)
- Right low beam (E2e2) (except CODE (631) Static left-hand traffic LED headlamp, except CODE (632) Static right-hand traffic LED headlamp, except CODE (640) High Performance LED, except CODE (641) DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP and except CODE (642) DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP)
- Right turn signal light (E2e5) (except CODE (631) Static left-hand traffic LED headlamp, except CODE (632) Static right-hand traffic LED headlamp, except CODE (640) High Performance LED, except CODE (641) DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP and except CODE (642) DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP)
- Right front side marker lamp (E2e6) (with CODE 494 (USA version) or CODE 460 (Canada version) and except CODE 640 (High Performance LED), except CODE 641 (DYNAMIC LEFT-HAND TRAFFIC LED HEADLAMP) and except CODE 642 (DYNAMIC RIGHT-HAND TRAFFIC LED HEADLAMP))
- Right parking light, standing light and daytime running lamp (E2e13) (except CODE 631 (Static left-hand traffic LED headlamp), except CODE 632 (Static right-hand traffic LED headlamp), except CODE 640 (High Performance LED), except CODE 641 (STATIC LEFT-HAND TRAFFIC LED HEADLAMP) and except CODE 642 (STATIC RIGHT-HAND TRAFFIC LED HEADLAMP))
Glove compartment lamp (E13/1) over glove compartment lamp switch (S17/9)
Stowage compartment illumination (E13/3) (with CODE 876 (Interior lights package) or CODE 877 (Ambiance illumination))
Right front footwell lamp (E17/15) (with CODE 876 (Interior lights package))
Left front footwell lamp (E17/16) (with CODE 876 (Interior lights package))
Left rear footwell lamp (E17/17) (with CODE 876 (Interior lights package))
Right rear footwell lamp (E17/18) (with CODE 876 (Interior lights package))
Left front illuminated door sill molding (E17/47) (with CODE 877 (Ambiance illumination))
Right front illuminated door sill molding (E17/48) (with CODE 877 (Ambiance illumination))
Left rear illuminated door sill molding (E17/51) (model 205.1, 253 with CODE 877 (Ambiance illumination))
Right rear illuminated door sill molding (E17/52) (model 205.1, 253 with CODE 877 (Ambiance illumination))
Windshield washer system pump (M5/1)
Coolant circulation pump (M13/5)
Electric steering lock control unit (transmission 716)
Windshield washer system junction box (R2/6) (with CODE 875 (Heated windshield washer system))
Spray nozzle hose heater (R2/11) (with CODE 875 (Heated windshield washer system))
Ambiance illumination power supply (with CODE 877 (Ambiance illumination))
Switch illumination power supply (circuit 58d)
Comfort switch and controls illumination power supply

Instrument panel LIN

The following components are actuated via the instrument panel LIN:

Analog clock
Driver-side instrument panel button group (with CODE 235 (Active Parking Assist), CODE 238 (Active Lane Keeping Assist), CODE 266 (DISTRONIC PLUS with Steer Assist and Stop & Go Pilot), CODE 463 (Head-up display) and CODE 501 (360° camera))

Roof LIN

The following components are actuated over the roof LIN:

Inside rearview mirror (A67) (with CODE 232 (Garage door opener) or CODE 249 (Automatically dimming mirror))
Overhead control panel control unit

Interior CAN

The signals are sent by the front 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).

Switching of relays

The following relays are switched by the front SAM control unit:

No-load current shutoff relay (F32/4k2)
Circuit 30g relay (F34kF)
Decoupling relay (F32/3k1) (model 205.012/047/147/212/247)
Relay, circuit 15R (K40/6kF)
Engine compartment circuit 15 relay (K40/8kG)
Horn relay (K40/8kL)
Wiper park position heater relay (K40/8kM)
ECO start/stop function additional battery relay (K114) (model 205.012/047/147/212/247)

	Wiring diagram for front signal acquisition and actuation module (SAM) control unit	Model 205, 253 Specification 1	PE54.21-P-2114-97FBA
		Model 205, 253 Specification 2	PE54.21-P-2114-97FBB