Component Description For Front Sam Control Unit - GF54.21-P-7010FG

Model 213 up to model year 2021 

Location 

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

Tasks 

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 
• Sending signals 

Reading in of sensors and signals 

The input factors are read in via the following connections:

• Direct line 
• Instrument panel LIN (LIN 1) 
• 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)
• Supplemental Restraint System control unit (N2/10) (crash signal)
• Powertrain control unit (N127) (Hot start request)
• Hazard warning system button (N72/1s57)
• Exterior lights switch (S1)
• Right front brake wear sensor (S10/2)
• Brake fluid level switch (S11)
• Coolant level switch (S41)
• Windshield washer system fluid level indicator 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 213.0/1 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 (Parking Pilot with PARKTRONIC) and code 489 (AIR BODY CONTROL) or code 238 (Active Lane Keeping Assist), code 266 (DISTRONIC PLUS with Steer Assist and Stop & Go Pilot), code 463 (Head-up display) or code 243 (Active Lane Keeping Assist))
• Analog clock (A70/1) (with code 246 (Analog clock))

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.

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 (except code 631 (Static LED headlamp, left-hand traffic) and except code 632 (Static LED headlamp, right-hand traffic) and except code P35 (Light package))
• Interior illumination
• Windshield wiper system

Actuation of components 

The following components are actuated via direct lines:

• Left front lamp unit (E1) (except code 631 (Static LED headlamp, left-hand traffic) and except code 632 (Static LED headlamp, right-hand traffic) and except code P35 (Light package))
• Right front lamp unit (E2) (except code 631 (Static LED headlamp, left-hand traffic) and except code 632 (Static LED headlamp, right-hand traffic) and except code P35 (Light package))
• Glove compartment lamp (E13/1) over glove compartment lamp switch (S17/9)
• Right front footwell lamp (E17/15) (except code 877 (Ambiance illumination))
• Left front footwell lamp (E17/16) (except code 877 (Ambiance illumination))
• Left front illuminated door sill molding (E17/47) (with code U25 (Door sills with "Mercedes-Benz" lettering, illuminated))
• Right front illuminated door sill molding (E17/48) (with code U25 (Door sills with "Mercedes-Benz" lettering, illuminated))
• Left horn (H2) and right horn (H2/1)
• Windshield washer system pump (M5/1)
• Relay in electric steering lock control unit (N26/5) (transmission 716)
• Spray nozzle hose heater (R2/11) (with code 875 (Heated windshield washer system))

The front SAM control unit additionally supplies voltage to the comfort switch and controls illumination, switch illumination (circuit 58d) and ambiance illumination (with code 877 (Ambiance illumination)).

Switching of relays 

The front SAM control unit switches the following relays:

• Engine compartment circuit 15 relay (K40/8kG)
• Wiper park position heater relay (K40/8kM)
• Battery disconnect switch relay (K57/4)
• ECO start/stop function auxiliary battery relay (K114) (model 213.016/050/053/054/216)
• ECO start/stop function diode (V19) (model 213.016/050/053/054/216)

Sending signals 

The front SAM control unit sends signals via the following connections:

• Instrument panel LIN 
• Rain and light sensor LIN 
• Interior CAN Instrument panel LIN 

The following components receive signals via the instrument panel LIN:

• Driver-side instrument panel button group (with code 235 (Parking Pilot with PARKTRONIC) and code 489 (AIR BODY CONTROL) or code 238 (Active Lane Keeping Assist), code 266 (DISTRONIC PLUS with Steer Assist and Stop & Go Pilot), code 463 (Head-up display) or code 243 (Active Lane Keeping Assist))
• Analog clock (with code 246 (Analog clock))

Rain and light sensor LIN 

The wiper motor receives signals via the rain/light sensor LIN.

Interior CAN 

The signals are sent by the front SAM control unit over the interior CAN.

Wiring diagram for front signal acquisition and actuation module (SAM) control unit

PE54.21-P-2114-97DBA