GF82.10-P-3080LE Substitute Lights and Emergency Lights Actuation, Function

GF82.10-P-3080LE Substitute Lights And Emergency Lights Actuation, Function

Function requirements, substitute/emergency lights actuation, general
^ Circuit 15 On

The status of circuit 15 is sent by the EIS [EZS] control unit (N73) to the interior CAN (CAN B).

Backup/emergency lights actuation, general
The backup/emergency lights actuation ensures the minimum exterior lighting if the event of failure of individual system components of vehicle exterior illumination.

The backup/emergency lights actuation is comprised of the following subfunctions:
^ Function sequence for substitute lamp actuation
^ Function sequence, emergency lights actuation

Function sequence for substitute lamp actuation
The function of all vehicle exterior lighting bulbs is checked. If certain bulbs fail, their function is simulated by actuating other bulbs, with pulse width modulation if necessary. In such an instance, flashing functions have priority over steady light. An active automatic lamp substitution function is notified to the instrument cluster (A1) by the front SAM control unit with fuse and relay module (N10/1) or the rear SAM control unit with fuse and relay module (N10/2) via the interior CAN. The message "substitute lights active" is displayed on the multifunction display of the instrument cluster (A1p13).
The scope of the substitute lamp actuation is country-specific.







Function sequence, emergency lights actuation
The aim of the emergency lights actuation is to prevent a complete failure of the vehicle outside lights due to a processor failure or due to the failure of the interior CAN.
To this end, both the front SAM control unit and the rear SAM control unit have separate hardware, which guarantees the emergency light function.
If the interior CAN or the SAM control unit fails, within t = 1.5 s the front standing lights and low beam actuation are activated by the independent hardware in the front SAM control unit and the rear standing lights actuation is activated by the independent hardware in the rear SAM control unit.

For vehicles with code (550) Trailer hitch, the trailer recognition control unit (N28/1) actuates the corresponding components in the trailer's lighting system via the trailer hitch socket, 13-pin (X58).