Test F: The Autolamps Are Inoperative

PINPOINT TEST F: THE AUTOLAMPS ARE INOPERATIVE

F1-F3:

F3-F4:

Normal Operation
When a request for the autolamps is detected by the lighting control module (LCM), the LCM sends a voltage reference signal to the light sensor through circuit 218 (WH/VT). The light sensor is provided ground through circuit 676 (PK/OG). When the light sensor pulls the voltage signal low (high ambient light condition), the LCM does not provide voltage to the exterior lamps.

Possible Causes
- Circuit 218 (WH/VT) short to ground
- Light sensor
- LCM