Test F: The Autolamps Are Inoperative

PINPOINT TEST F: THE AUTOLAMPS ARE INOPERATIVE

F1-F2:

F2-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 high ambient light conditions exist, the light sensor pulls the voltage signal low. When low ambient light conditions exist, the voltage signal to the light sensor is read as high by the LCM. Based on input from the light sensor, LCM determines when to supply voltage to the exterior lamps.

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