High Beam Headlamps
WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
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 flash-to-pass (regardless of headlamp switch position), or the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the HIGH BEAM position, the SJB energizes an internal relay which routes voltage through circuit CLS08 (VT/GN) to the high beam headlamps.
| DTC - Description | Fault Trigger Conditions |
|---|---|
| B1472 - Lamp Headlamp Input Circuit Short to Ground | An on-demand DTC that sets when the SJB detects the headlamps on input circuit is short to ground. |
| B1510 - Flash To Pass Switch Circuit Short To Ground | An on-demand DTC that sets when the SJB detects the high beam request input circuit is short to ground. |
| B1570 - Lamp Headlamp High-Beam Circuit Short To Ground | An on-demand DTC that sets when the SJB detects the high beam request input circuit is short to ground. |
| B1578 - Lamp Park Input Circuit Short To Ground | An on-demand DTC that sets when the SJB detects a short to ground in the parking lamps on input circuit. |
| B1795 - Lamp Headlamp Low-Beam Circuit Open | A continuous DTC and sets when the SJB detects an open in the LH or RH low beam output circuit. |
| B2498 - Headlamp Switch Multiple Signals Input Active | A continuous DTC that sets when the SJB detects no inputs from the headlamp switch or multiple headlamp switch requests at the same time. |
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- HID relay
- Headlamp switch
- Multifunction switch
- SJB