Notes for Service department

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General notes

Adjust headlights for targeted illumination.

There is a service function for setting the headlights for targeted illumination.

Monitoring of light source

All light sources in the headlights are monitored, when in the switched on state, by the control unit for the left-hand targeted illumination (GZAL) or the control unit for the right-hand targeted illumination (GZAR). The monitoring starts at terminal 15 ON.

Hot monitoring with light ON

Hot monitoring is based on the current measurement. The power consumption readings assist in detection of short and open circuits. For example, If during a switched on function indicator light the power consumption of the light-emitting diodes cannot be measured, the control unit GZAL or GZAR identifies a faulty function indicator light. The control unit GZAL or GZAR no longer activates the function indicator light and stepper motor in the affected headlight for targeted illumination. The instrument panel (KOMBI) displays a Check Control message.

If a headlight for targeted illumination goes out, the system continues to use the second headlight.

Thiefproofing

The headlights for targeted illumination are securely assigned to the works of the vehicle (via vehicle identification number). By doing this, the headlights only function in this vehicle. That is why the control unit GZAL or GZAR must be re-encoded when replacing a headlight.