Headlight switch off delay function - GF82.10-P-2011GM

MODEL 164.1 as of model year 2009 /YoM 08 model refinement package 

MODEL 164.8, 251.0 /1 as of model year 2009 /YoM 08 

Function requirements for headlamp switch-off delay (SWA), general 

- No overvoltage or undervoltage (operating voltage range U ≥7 ≤17.5 V)

- Function activated via instrument cluster (A1)

- Rain/light sensor (B38/2) signals "Darkness detected"

- Rotary light switch (S1) in the "AUTO" position (with code (460) Canada version or with code (494) USA version)

SWA, general 

The headlamp switch-off delay (SWA) function is used for leaving and finding the vehicle safely in darkness by switching on the vehicle ambient illumination.

The headlamp switch-off delay (SWA) function consists of the following subfunctions:

- Function sequence for headlamp switch-off delay (SWA)

- Function sequence for locator lighting (AFB)

Function sequence for headlamp switch-off delay (SWA) 

After switching off the engine and removing the transmitter key (A8/1) from the EZS control unit (N73) the headlamp switch-off delay (SWA) function is requested.

The following information is evaluated by the front SAM control unit (N10) for output of the headlamp switch-off delay (SWA) function:

- Activated headlamp switch-off delay function provided by the instrument cluster on the interior CAN (CAN B)

- Circuit 15 status sent by the EZS control unit to the interior CAN

- Data from the rain/light sensor provided on the interior CAN by the overhead control panel control unit (N70)

- Status of rotary light switch provided on the interior CAN by the upper control panel control unit (N72/1)

After switching off the engine, the vehicle ambient illumination is switched on for a time interval of t = 60 s. When a vehicle door or the liftgate is opened, the time interval restarts. The rear SAM control unit (N10/8) transmits the status of the vehicle doors and the liftgate via the interior CAN to the front SAM control unit.

The front SAM control unit evaluates all of the relevant information and transmits the request to switch on the vehicle ambient illumination via the interior CAN to the following control units:

- Rear SAM control unit

- Left front door control unit (N69/1)

- Right front door control unit (N69/2)

The following components of the vehicle ambient illumination are actuated by the front SAM control unit:

- Left standing light and parking light (E1e3) (model 164, model 251 as of 1.8.10)

- Right standing light and parking light (E2e3) (model 164, model 251 as of 1.8.10)

- Left standing light and parking light (E6/13) (model 251 up to 31.7.10)

- Right standing light and parking light (E6/14) (model 251 up to 31.7.10)