Test G: The Autolamps Are Inoperative
PINPOINT TEST G: THE AUTOLAMPS ARE INOPERATIVENormal Operation
When the headlamp switch is in the AUTOLAMPS ON position, the smart junction box (SJB) monitors the light sensor by sending a voltage reference signal through circuit VLF14 (BU/BN). Ambient lighting to the light sensor changes the voltage by varying the resistance to ground. Ground for the light sensor is provided by circuit GD116 (BK/VT).
When the ambient level has reached a point (determined by the internal programming of the SJB), the SJB provides voltage to the exterior lamps.
- DTC B1793 (Autolamp Sensor Input Circuit Short To Ground) - is a continuous DTC that sets when the SJB detects a short to ground on the light sensor input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Light sensor
- SJB
G1-G4:
G4-G5:
