Headlight switch off delay, function - GF82.10-P-2011FLM

MODEL 212 as of model year 2014 

Function requirements, general 

• No overvoltage or undervoltage (operating voltage range U ≥ 7 ≤ 17.5 V)
• "Ambient illumination:" function activated in "Settings" menu under "Light" in the instrument cluster (A1)
• Rain/light sensor (B382) signals "Darkness detected"
• Exterior lights switch (S1) in position "AUTO"

The instrument cluster sends the status of the "Ambient illumination:" function via interior CAN (CAN B) to the front SAM control unit with fuse and relay module (N10/1).

The status of the rain/light sensor is read in by the front SAM control unit via wiper/inside rearview mirror LIN (LIN 2).

The front SAM control unit reads in the status of the exterior lights switch directly.

Headlamp switch-off delay (SWA), general 

The SWA is used for leaving and finding the vehicle safely in darkness by switching on the ambient illumination.

The following light functions are activated here:

• Standing/parking lights actuation

  Detailed information about the standing/parking lights actuation is contained in the separate "Standing/parking lights actuation, function" subfunction.

• Ambient illumination via left outside mirror ambient lamp (M21/1e1) in the left outside mirror (M21/1) and right outside mirror ambient lamp (M21/2e1) in the right outside mirror (M21/2)

The SWA function is comprised of the following subfunctions:

• Function sequence for headlamp switch-off delay (SWA) 
• Function sequence for locator lighting (AFB) 

The headlamp switch-off delay and locator lighting functions run in parallel if necessary. An active headlamp switch-off delay (SWA) function is not terminated by a requested AFB function and vice versa.

Function sequence for headlamp switch-off delay (SWA) 

The headlamp switch-off delay function is activated after the driver switches off the engine (change in status of circuit 15 On to circuit 15R On) for t = 60 s. The electronic ignition lock control unit (N73) sends the status of circuit 15 to the front SAM control unit via interior CAN. The front SAM control unit then activates the standing/parking lights actuation. At the same time, the front SAM control unit sends the request to switch on the ambient illumination via interior CAN to the following control units:

• Left front door control unit (N69/1)
• Right front door control unit (N69/2)

The left front door control unit actuates the left outside mirror ambient lamp. The right front door control unit actuates the right outside mirror ambient lamp.

The function starts again by opening a vehicle door. The trunk lid (model 212.0/1) or the liftgate (model 212.2) is considered a vehicle door. Once all vehicle doors are closed again, the function restarts but is limited to t = 15 s.

The left front door control unit or the right front door control unit sends the status of the respective front door via interior CAN to the front SAM control unit. The status of the rear doors, the trunk lid or the liftgate is sent by the rear SAM control unit with fuse and relay module (N10/2) via interior CAN to the front SAM control unit.

The active headlamp switch-off delay is terminated by switching on circuit 15 or by triggering an antitheft alarm system (ATA [EDW]) alarm (with code (551) Antitheft alarm system (ATA [EDW])). The rear SAM control unit sends the status of the ATA [EDW] via interior CAN to the front SAM control unit.

Function sequence for AFB 

When unlocking the vehicle using a radio frequency or infrared, the ambient illumination is switched on for a period of t = 40 s (time for the automatic relocking).

The electronic ignition lock control unit sends the status of the central locking via interior CAN to the front SAM control unit.

The front SAM control unit then activates the standing/parking lights actuation. At the same time, the front SAM control unit sends the request to switch on the ambient illumination via interior CAN to the following control units:

• Left front door control unit
• Right front door control unit

The left front door control unit actuates the left outside mirror ambient lamp. The right front door control unit actuates the right outside mirror ambient lamp.

The locator lighting function is aborted by opening a vehicle door or activating circuit 15C.

	Electrical function schematic, headlamp switch-off delay (SWA)		PE82.10-P-2062-97DAB
	Overview of exterior lights system components		GF82.10-P-9998FLM