Ambient Light Sensor: Testing and Inspection

Checking dusk sensor

Fault-tracing information

Note! Before this symptom troubleshooting is started, check that no relevant trouble codes are stored.

A damaged dusk sensor may affect different functions in the vehicle.

The following functions in the vehicle are affected by a damaged dusk sensor:
- Automatic damping of display and instrument lighting in dark.
- Active headlights (Active Bending Lights, ABL) (option).
To check if the dusk sensor is damaged, proceed as follows:
1. Click on the symbol for VCT2000 and read out present voltage from the dusk sensor.
2. Shine a light at the dusk sensor.
3. Check that the read-out voltage decreases.
If the voltage does not change, the dusk sensor is damaged and shall be replaced.
Remedy as necessary.





Continue - FAULT FOUND

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