Checking The Status

Fig 1: Identifying Ignition ON

GLL101051

Courtesy of VOLVO CARS CORPORATION

Ignition on.
Check the twilight sensor signal by varying the intensity of the light that it detects. Cover the twilight sensor with your hand to obtain the minimum signal, approximately 0.5 volts.

Then aim a strong light source (for example a flashlight) at the twilight sensor from close range to increase the signal.

HINT: If the signal from the twilight sensor indicates <0.25 volts, there is either a short-circuit to ground in the signal cable or the twilight sensor is defective.

Click on the VCT2000 symbol to read off the light intensity (voltage).

NOTE:
The illustration only shows the method. The appearance of the twilight sensor can vary between different models.

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA (Volvo Scan Tool)
Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Sun Sensor
Courtesy of VOLVO CARS CORPORATION

Continue
Refer to CHECKING THE COMPONENT AND WIRING