Test D: The Headlamps Are On Continuously

PINPOINT TEST D: THE HEADLAMPS ARE ON CONTINUOUSLY

Normal Operation - Low Beams
The smart junction box (SJB) sends reference signals to the headlamp switch through circuits CLF19 (VT/GN), CLF23 (WH/VT), CLF24 (YE/BU) and CLS05 (BU/GY). At any given time, the headlamp switch routes one of the input circuits to ground through circuit GD114 (BK/BU).

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

Normal Operation - High Beam Headlamps
The SJB sends a reference signal to the multifunction switch through circuits CLF02 (GY/BN) and CLF27 (GN/BN). 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 flash-to-pass or high beams (when the low beams are on), the SJB energizes the high beam relay (integral to the SJB), which routes voltage through circuit CLF08 (YE/VT) to the headlamps.

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 short to ground.

DTC B1510 (Flash To Pass Switch Circuit Short to Ground) - is an on-demand DTC that sets when the SJB detects the flash-to-pass request input circuit is short to ground.

DTC B1696 (Autolamp On Circuit Short To Ground) - is an on-demand DTC that sets when the SJB detects the autolamps on request input circuit is short to ground.

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 input circuit open.

DTC B2A23 (High Beam Input Circuit Short to Ground) - is an on-demand DTC that sets when the SJB detects a short to ground on the high beam request input circuit.

DTC B2A2E (Right Front Lamp Low Beam Circuit Open) - is an on-demand DTC that sets when the SJB detects the RH low beam output circuit shorted to voltage.

DTC B2A30 (Left Front Lamp Low Beam Circuit Open) - is an on-demand DTC that sets when the SJB detects the LH low beam output circuit shorted to voltage.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Headlamp switch
- Multifunction switch
- SJB

D1-D3:

D4-D7:

D8-D13:

D13-D14: