Test G: The Autolamps Are On Continuously

PINPOINT TEST G: THE AUTOLAMPS ARE ON CONTINUOUSLY

G1:

G1-G5:

G5-G7:

G8-G9:

Normal Operation
The lighting control module (LCM) sends voltage signals to the headlamp switch through circuits 220 (VT/OG), 1400 (TN/WH), 1032 (WH/BK) and 1033 (RD/YE). The headlamp switch routes a signal to ground through circuit 57 (BK) for any given headlamp switch position. If the LCM detects a fault with the headlamp switch input, the LCM defaults the exterior lamps on.

When a request for the autolamps is detected, 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 does not pull the voltage signal low (low ambient light condition), the LCM provides voltage to the exterior lamps.

Possible Causes
- Circuit 57 (BK) open
- Circuit 218 (WH/VT) open or short to voltage
- Circuit 220 (VT/OG) open or short to ground
- Circuit 676 (PK/OG) open
- Circuit 1032 (WH/BK) open or short to ground
- Circuit 1033 (RD/YE) open or short to ground
- Circuit 1400 (TN/WH) open or short to ground
- Light sensor
- Headlamp switch
- LCM