Test D: The Headlamps Are On Continuously

PINPOINT TEST D: THE HEADLAMPS ARE ON CONTINUOUSLY

D1-D2:

D3-D6:

D7-D11:

D12:

Normal Operation
The smart junction box (SJB) sends reference signals to the headlamp switch through circuits CLF18 (BU/WH), CLF19 (VT/GN), CLF23 (WH/VT) and CLS34 (GY). When the headlamp switch is placed in the HEADLAMPS ON position, the voltage signal is routed to ground.

When the SJB detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the LOW BEAM position, the SJB sends voltage through circuits CLF04 (BN/BU) (LH headlamp) and CLF05 (BU/GN) (RH headlamp) to the low beam headlamps.

When the SJB detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the HIGH BEAM position, the SJB sends voltage through circuits CLF02 (GY/BN) (LH headlamp) and CLF03 (VT/OG) (RH headlamp) to the high beam headlamps.

The SJB sends a reference signal to the multifunction switch through circuits CLF27 (GN/BN) and CLF17 (WH/OG). When the multifunction switch is placed in the FLASH-TO-PASS or HIGH BEAM position, the voltage signal is routed to ground. When the SJB detects a request for the flash-to-pass, the SJB sends voltage to the high beam headlamps.

DTC B1472 - is an on-demand DTC that sets when the SJB detects no input from the headlamp switch. DTC B1510 - is an on-demand DTC that sets when the SJB detects a short to ground from the flash-to-pass input circuit.

DTC B2501 - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage from the LH low beam voltage supply circuit.

DTC B2503 - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage from the RH low beam voltage supply circuit.

DTC B2505 - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage from the LH high beam voltage supply circuit.

DTC B2507 - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage from the RH high beam voltage supply circuit.

Possible Causes
- Circuit CLF02 (GY/BN) short to voltage
- Circuit CLF03 (VT/OG) short to voltage
- Circuit CLF04 (BN/BU) short to voltage
- Circuit CLF05 (BU/GN) short to voltage
- Circuit CLF17 (WH/OG) short to ground
- Circuit CLF18 (BU/WH) open or short to ground
- Circuit CLF19 (VT/GN) open or short to ground
- Circuit CLF23 (WH/VT) open
- Circuit CLF27 (GN/BN) short to ground
- Circuit GD145 (BK/BU) open
- Multifunction switch
- Headlamp switch
- SJB