Manual Transaxle
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The reversing lamp switch controls the coil ground side of the reversing lamps relay. When the transaxle is in REVERSE (R), the reversing lamp switch contacts close, completing the path to ground for the reversing lamps relay coil.
- DTC P1910 (Reverse Lamp Control Circuit/Open) - sets when the PCM detects no voltage on the reversing lamp relay coil ground control circuit (if the coil voltage supply circuit or the coil ground control circuit is open).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Reversing lamps relay
- Reversing lamp switch
- PCM
- TCM