Substitute Lights And Emergency Lights Actuation, Function - GF82.10-P-3080FR
Model 257, 290
up to model year 2021
Function requirements, general
- Terminal 15 ON
The electronic ignition lock control unit (N73) transmits the status of circuit 15 via the interior CAN (CAN B) to the front SAM control unit (N10/6) and the rear SAM control unit (N10/8).
Backup/emergency lights actuation, general
The backup/emergency lights actuation ensures that the minimum amount of exterior lighting is provided in the event of failure of individual vehicle exterior illumination system components.
The backup/emergency light actuation consists of the following subfunctions:
- Function sequence for substitute lights control (except code 460 (Canada version) and except code 494 (USA version))
- Function sequence for emergency light actuation
Function sequence for substitute lights control (except code 460 (Canada version) and except code 494 (USA version))
The rear SAM control unit (N10/8) continuously monitors the function of the vehicle's rear lighting.
If the left rear turn signal light (E3e1) in the left rear lamp unit (E3) fails, the rear SAM control unit flashes the left brake light (E3e4).
If the right rear turn signal light (E4e1) in the right rear lamp unit (E4) fails, the rear SAM control unit flashes the right brake light (E4e4).
A failure of the rear turn signal light is shown on the instrument cluster (A1). To this end, the rear SAM control unit sends corresponding information via interior CAN, electronic ignition lock control unit and user interface CAN (CAN HMI) to the instrument cluster.
Function sequence for emergency light actuation
If the interior CAN or the peripherals CAN (CAN PER) malfunctions, the front SAM control unit and the rear SAM control unit activate software emergency lighting. The rear SAM control unit actuates the taillights and the brake lights (depending on the status of circuit 54). The front SAM control unit activates the standing lights and low beams. If the rain/light sensor with additional functions (B38/2) fails or communication with the rain/light sensor with additional functions fails, the front SAM control unit activates the auto on/off driving lights.
The left headlamp control unit (E1n9) and the right headlamp control unit (E2n9) and on vehicles with code P35 (Light Package) the front left lamp unit LED matrix control unit (E1n11) and the front right lamp unit LED matrix control unit (E2n11) are powered by the front SAM control unit through circuit 30L. The power supply is provided in each case crosswise.
If the front SAM control unit is defective, a circuit 30L is missing or a driver has failed, then the low beams are actuated at one side of the vehicle, for example, and the standing lights are actuated at the other side.
| Overview of exterior lights system components | GF82.10-P-9998FR |