Test G: The Autolamps Are On Continuously
PINPOINT TEST G: THE AUTOLAMPS ARE ON CONTINUOUSLYNormal Operation
The SJB sends reference signals to the headlamp switch through circuits CLF19 (VT/GN), CLF23 (WH/VT), CLS34 (GY) and CLF18 (BU/WH). At any given time, the headlamp switch routes one of the input circuits to ground through circuit GD111 (BK/BU).
The SJB also sends a reference voltage signal to the light sensor through circuit VLF14 (BU/BN) to monitor the ambient light. Ground for the light sensor is provided by the heating ventilation air conditioning (HVAC) module through circuit RH111 (GY/BU).
When the SJB detects the headlamp switch in the AUTOLAMPS ON position, the SJB monitors the light sensor input. The light sensor determines the amount of light based on the input received from the ambient lighting conditions. When the ambient level has reached a point (determined by the internal programming of the SJB), the SJB provides voltage to the headlamps, parking and license plate lamps.
- DTC B1472 (Lamp Headlamp Input Circuit Short to Ground) - is an on-demand DTC that sets when the SJB detects the headlamps on input circuit is shorted to ground.
- DTC B1696 (Autolamp On Circuit Short To Ground) - is an on-demand DTC that sets when the SJB detects the autolamps on input circuit shorted to ground.
- DTC B1791 (Autolamp Sensor Input Circuit Open) - is an on-demand DTC that sets when the SJB detects an open on the light sensor input circuit.
- 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 light sensor input circuit.
- DTC B2008 (Wipers On Signal Circuit Short to Ground) - is an on-demand DTC that sets when the SJB detects the wipers on input circuit is short to ground.
- DTC B2A22 (Headlamp Off Circuit Open) - is an on-demand DTC that sets when the SJB detects the headlamp switch off circuit open.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Light sensor
- Headlamp switch
- Windshield wiper motor
- HVAC system
- SJB
G1-G3:
G4-G8:
G8-G10:
G10-G12:
G12-G14:
G14-G15:
