Front Fog Light Actuation, Function - GF82.10-P-3070FR

Model 257, 290

up to model year 2021

Function requirements, general

No undervoltage or overvoltage
Terminal 15 ON
Low beam ON

The electronic ignition lock control unit (N73) sends the status of circuit 15 via interior CAN (CAN B) to the front SAM control unit (N10/6).

Low beams actuation is active during fog light actuation.

Front fog light actuation, general

Front fog light actuation enables the rear of the vehicle to be identified in poor weather conditions.

Function sequence for front fog light actuation

The rear fog light actuation is requested by pressing the rear fog light button (S1s10) on the exterior lights switch (S1).

The front SAM control unit reads in the status of the rear fog light button directly and sends the request to switch on the rear fog light via interior CAN to the rear SAM control unit (N10/8) and on vehicles with CODE 550 (Trailer hitch) to the trailer recognition control unit (N28/1).

The rear SAM control unit directly actuates the following component in accordance with the country coding:

Left rear fog light (E3/1e5) in inner left rear lamp unit (E3/1) (model 257, left-hand drive vehicle)
Right rear fog light (E4/1e5) in inner right rear lamp unit (E4/1) (model 257, right-hand drive vehicle)
Left rear fog lamp (E3/3) (model 290, left-hand drive vehicle, except code 460 (Canada version) and except code 494 (USA version))
Right rear fog lamp (E3/4) (model 290, right-hand drive vehicle, except code 460 (Canada version) and except code 494 (USA version))

The trailer recognition control unit (with CODE 550 (Trailer hitch)) actuates the corresponding rear fog light on the trailer via the trailer socket (X58).

The rear fog light on the vehicle is not actuated during trailer operation. For this purpose, the trailer recognition control unit sends a corresponding signal with the information "Operational rear fog lamp exists on trailer" via interior CAN to the rear SAM control unit.

The active rear fog light actuation is indicated visually to the driver. The front SAM control unit sends the "Rear fog light indicator lamp ON" request via the interior CAN, electronic ignition lock control unit and user interface CAN (CAN HMI) to the instrument cluster (A1), which then actuates the rear fog light warning indicator.

	Electrical function schematic for front fog light actuation		PE82.10-P-2056-97XBA
	Overview of exterior lights system components		GF82.10-P-9998FR