Notes for Service department: Diagnosis

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The footwell module (FRM) or the Body Domain Controller (BDC) allows the LED headlight to be diagnosed. The LED headlights are set to the "diagnostic mode" for carrying out various diagnosis orders.

Missing or implausible bus signals are stored as faults in the footwell module (FRM) or in the Body Domain Controller (BDC).

General notes

Monitoring of light source

Faulty LEDs are detected by the LED main light module or by the headlight driver module and transmitted to the footwell module (FRM) or the Body Domain Controller (BDC) as fault messages.

Hot monitoring at "lights on"

The hot monitoring is based on the current measurement of the individual outputs of the footwell module (FRM) or the Body Domain Controller (BDC). The power consumption readings assist in detection of short and open circuits. Failure of the LED headlights is indicated as a Check Control message in the instrument cluster (KOMBI).

Emergency operation

If a fault occurs in the footwell module (FRM) or in the Body Domain Controller (BDC) that could lead to a malfunction of the LED headlight, an emergency operation is activated by the LED main light module. In the event of a fault in the LED main light module, emergency operation is activated by the footwell module (FRM) or the Body Domain Controller (BDC). However, the driving lights remain switched on until the vehicle is stopped. The malfunction is displayed to the driver as a Check Control message in the instrument cluster (KOMBI).

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