DTC B2648: Ambient Light Sensor Circuit High: Notes
Body Control Module (BCM) monitors circuit No. 278 (White wire) to determine when headlights need to be turned on when headlight switch is in AUTO mode. See WIRING DIAGRAMS . If circuit to BCM is shorted to battery voltage, DTC will set.
Conditions for setting DTC:
- Circuit No. 278 (White wire) is shorted to battery voltage.
- System voltage 9-16 volts.
- Conditions met for .5 second.