Test G: The Autolamps Are On Continuously

PINPOINT TEST G: THE AUTOLAMPS ARE ON CONTINUOUSLY

G1-G2:

G3-G7:

G7-G8:

G8-G9:

G9-G10:

G11-G12:

G12-G13:

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). On vehicles with manual climate control, ground for the light sensor is provided by circuit GD133 (BK). On vehicles with electronic automatic temperature control (EATC), ground for the light sensor is provided by the EATC module through circuit RH111 (GY/BU).

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 monitors the light sensor input. 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 provides voltage to the headlamps, parking and license plate lamps.

DTC B1472 - is an on-demand DTC that sets when the SJB detects the headlamps on input circuit is short to ground.

DTC B1696 - is an on-demand DTC that sets when the SJB detects a short to ground in the autolamps on input circuit.

DTC B1791 - is an on-demand DTC that sets when the SJB detects an open on the light sensor input circuit.

DTC B1793 - is a continuous and on-demand DTC that sets when the SJB detects a short to ground on the light sensor input circuit.

DTC B2A22 - is an on-demand DTC that sets when the SJB detects an open from the headlamp switch off circuit.

Possible Causes
- Circuit CLF19 (VT/GN) open or short to ground
- Circuit CLF23 (WH/VT) open
- Circuit CLF24 (YE/BU) short to ground
- Circuit CLS05 (BU/GY) open
- Circuit GD133 (BK) open
- Circuit GD138 (BK/WH) open
- Circuit RH111 (GY/BU) open
- Circuit VLF14 (BU/BN) open, short to ground or voltage
- Light sensor
- Headlamp switch
- EATC system
- SJB