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