DTC B1799: Front Turn Signal Output Circuit Open
WARNING: This page is about a different car, the 1997 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.
- Check Left Turn Signal - Turn hazard switch on. Observe Left front turn signal. If light flashes, go to next step. If light does not flash, go to step 3).
- Check Right Turn Signal - Turn hazard switch on. Observe right front turn signal. If light flashes, replace LCM and retest system. If light does not flash, go to step 5).
- Check Circuit No. 3 For Battery Voltage - Turn hazard switch on. Disconnect connector to left turn signal light (miniature bulb). Measure voltage between ground and Light Green/White wire at left turn signal bulb wiring harness connector. If battery voltage is present when bulb is supposed to be on, go to next step. If battery voltage is not present, repair open or short to ground in Light Green/White wire. Retest system.
- Check Ground Circuit At Left Turn Signal - Measure resistance between ground and Black wire at left turn signal bulb wiring harness connector. If resistance is 5 ohms or less, replace bulb and retest system. If resistance is more than 5 ohms, repair open circuit No. 57 (Black wire) and retest system.
- Check Circuit No. 2 For Battery Voltage - Turn hazard switch on. Disconnect connector to right turn signal light (miniature bulb). Measure voltage between ground and White/Light Blue wire at right turn signal bulb wiring harness connector. If battery voltage is present, go to next step. If battery voltage is not present, repair open or short to ground on circuit No. 2 (White/Light Blue wire) as necessary. Retest system.
- Check Ground Circuit At Right Turn Signal - Measure resistance between ground and Black wire at right turn signal bulb wiring harness connector. If resistance is 5 ohms or less, replace bulb and retest system. If resistance is more than 5 ohms, repair open circuit No. 57 (Black wire) and retest system.