Diagnostic trouble code information

Condition 

Fig 1: Identifying Twilight Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the control module registers that the signal from the twilight sensor exceeds 95% or falls below 5% of the supply voltage (approximately 5V).

Substitute Value 

• Nothing.

Possible Source 

• Defective nightfall sensor.

• Defective measuring instrument.

Fault symptom[s] 

• Button diodes come on brightly.