GF82.10-P-2011RI Headlight Switch Off Delay Function

GF82.10-P-2011RI Headlight Switch Off Delay Function

Function requirements, headlamp switch-off delay (SWA), general
^ Function activated via instrument cluster (A1)
^ Engine switched off and transmitter key (A8/1) removed
^ Rain/light sensor (B38/2) reports darkness
^ Rotary light switch (S1) in the auto on/off headlamps position (for code (494) USA version)

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

SWA comprises the following subfunctions:
^ Function sequence for SWA
^ Function sequence for locator lighting (AFB)

Function sequence for SWA
The following information is made available to the driver-side SAM control unit (N10/10) for issuing the SWA function on the interior CAN:
- Activated SWA function by the instrument cluster
- Circuit status of circuit 15 from the EIS [EZS] control unit (N73)
- Rain/light sensor status from the overhead control panel control unit (N70)

The driver-side SAM control unit reads in the status of the rotary light switch directly.

Once the engine is switched off and the transmitter key is removed from the electronic ignition switch control unit the vehicle ambient illumination is switched on for a period of t = 60 s. When a door or the trunk lid is opened, the function sequence starts again.

The rear SAM control unit (N10/8) places the status of the vehicle doors and trunk lid on the interior CAN.

The driver-side SAM control unit evaluates all relevant information and transmits a corresponding signal via the interior CAN to the front passenger-side SAM control unit (N10/11) and the rear SAM control unit.

The following components of the vehicle ambient illumination are actuated by the driver-side SAM control unit:
- Left standing and parking lights (E1e3)
- Left front fog lamp (E5/1)
- Left front side-marker lamp (United States of America) (E6/1) (for code (494) USA version)

The following components of the vehicle ambient illumination are actuated by the front passenger-side SAM control unit:
- Right standing and parking lights (E2e3)
- Right fog lamp (E5/2)
- Right front side-marker lamp (United States of America) (E6/2) (for code (494) USA version)

The following components of the vehicle ambient illumination are actuated by the rear SAM control unit:
- Left brake light, taillight and parking light (E3e9)
- Right brake light, taillight and parking light(E4e9)
- Left side marker lamp (United States of America) (E3e6) and right side marker lamp (United States of America) (E4e6) (for code (494) USA version)
- Left license plate lamp (E19/1) and right license plate lamp (E19/2)

By briefly switching on circuit 15 after switching off the engine it is possible to discretely leave the vehicle without activating the SWA.

The active SWA is interrupted immediately by switching on circuit 15 or by triggering an anti-theft alarm system (ATA [EDW]) alarm.

Function sequence for AFB
The vehicle ambient illumination is switched on for a period of t = 40 s when the vehicle is unlocked by means of the transmitter key. The request "unlock vehicle" is transmitted to the driver-side SAM control unit by the EIS [EZS] control unit via the interior CAN. The driver-side SAM control unit issues the switch-on request for the vehicle ambient illumination over the interior CAN to the corresponding control units. The components are actuated as described for the SWA function.

The AFB function is terminated by opening a vehicle door, by inserting the transmitter key into the EIS [EZS] control unit or by triggering an ATA [EDW] alarm.

The SWA and AFB functions operate in parallel if necessary. An active SWA function is not terminated by a requested AFB function and vice versa.