Test F: The Autolamps Are Inoperative
PINPOINT TEST F: THE AUTOLAMPS ARE INOPERATIVENormal 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 GD145 (BK/BU). When the headlamp switch is placed in the AUTOLAMPS ON position, the voltage signal is routed to ground through circuit GD145 (BK/BU). 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.
- DTC B1793 (Autolamp Sensor Input Circuit Short to Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground on the autolamp sensor input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Light sensor
- SJB
F1-F3:
F3-F5:
