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

Model 172.4 as of model year 2017 

Function requirements for front fog light actuation, general 

• No overvoltage or undervoltage (operating voltage range U ≥ 7 ≤ 17.5 V)
• Low beam ON
• Exterior lights switch (S1) in position "A"
• Terminal 15 ON

The electronic ignition switch control unit (N73) sends the status of circuit 15 to the front SAM control unit with fuse and relay module (N10/1) via interior CAN (CAN B).

Front fog light actuation, general 

Front fog light actuation enables better identification of the rear of the vehicle in poor weather conditions.

During front fog light actuation standing/parking lights actuation is also active, which is described in a separate document.

The "Extended fog light function" is described in a separate document.

Function sequence for front fog light actuation 

Pressing the rear fog light button (S1s10) on the exterior lights switch requests fog light actuation. The front SAM control unit reads in the status of the rear fog light button directly and sends the "switch on rear fog light" request over the interior CAN to the rear SAM control unit with fuse and relay module (N10/2).

The rear SAM control unit actuates the left rear fog light (E3e5) in the left rear lamp unit (E3) or the right rear fog light (E4e5) in the right rear lamp unit (E4) in accordance with the national code.

The active front fog light actuation is indicated visually to the driver. To do so, the front SAM control unit sends the "Rear fog light indicator lamp On" request via interior CAN to the instrument cluster (A1), which then actuates the rear fog light indicator lamp (A1e18).