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Home >> Mercedes Benz >> 2008 >> CL550 >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Entertainment, Lighting & Navigation -- Cl550 -- 216 Chassis >> Basic Knowledge >> Front fog lamp actuation, function - GF82.10-P-3070SX

Front fog lamp actuation, function - GF82.10-P-3070SX

MODEL 216.3, 221.0 /1 up to Model Year 8 

Fig 1: Identifying CAN Communication Diagram Of Front Fog Lamp Actuation
G07641959Courtesy of MERCEDES-BENZ USA

Shown on model 221 

Front fog lamp actuation 

Function requirements 

Function 

The switch position of the rotary light switch is read in over the UCP [OBF] LIN by the upper control panel control unit.

The upper control panel control unit places the request on the interior CAN.

The front SAM control unit receives the request and actuates the front fog lamps.

The front fog lamps indicator lamp in the rotary light switch visually indicates that the front fog lamps are switched on.

Rear fog lights actuation 

Function requirements: 

Function 

The switch position of the rotary light switch is read in over the UCP [OBF] LIN by the upper control panel control unit.

The upper control panel control unit places the request on the interior CAN. The request is forwarded by the front SAM control unit to the rear SAM control unit.

The rear SAM control unit actuates the left rear fog light.

The rear fog lamp indicator lamp in the rotary light switch provides visual feedback that the left rear fog light is on.

Vehicles with code (550) Trailer hitch 

The front SAM control unit forwards the request over the interior CAN to the trailer recognition control unit which actuates the trailer hitch socket.

IMPORTANT During trailer operation, the left rear fog light on the tractor vehicle is not actuated.

Driver-side SAM control unit with fuse and relay module, component description N10/1 GF54.21-P-6010SX
Rear SAM control unit with fuse and relay module, component description N10/2 GF54.21-P-6030SX
Trailer recognition control unit component description N28/1
Model 221 with code (550) Trailer hitch
GF31.19-P-4050SX
Upper control panel control module component description N72/1 GF54.21-P-6040SX
Rotary light switch, component description S1 GF82.10-P-4106SX