Test G: The Autolamps Are Inoperative

PINPOINT TEST G: THE AUTOLAMPS ARE INOPERATIVE

G1-G4:

G5:

Normal Operation
The smart junction box (SJB) sends a reference signal to the headlamp switch through circuit CLF19 (VT/GN) and a signal to the light sensor through circuit VLF14 (BU/BN). Ground for the light sensor is provided by circuit GD116 (BK/VT). When the headlamp switch is placed in the AUTOLAMPS ON position, the voltage signal is routed to ground. When the SJB detects the headlamp switch in the AUTOLAMPS ON position, the SJB sends out voltage to the exterior lamps if the ambient light conditions are dark. The light sensor determines the amount of light based on the input received from the ambient sky conditions. When the ambient level has reached a point (determined by the internal programming of the SJB), the SJB sends voltage to the headlamps, parking and license plate lamps.

Possible Causes
- Circuit VLF14 (BU/BN) short to ground
- Light sensor
- SJB