Test O: The Reversing Lamps Are Inoperative

PINPOINT TEST O: THE REVERSING LAMPS ARE INOPERATIVE

Normal Operation - Vehicles Equipped With 4R75E Transmission
The digital transmission range (TR) sensor receives voltage from the central junction box (CJB) fuse 12 (15A) through circuit 296 (WH/VT). When the transmission is placed in REVERSE (R), the digital TR sensor routes voltage to the reversing lamps through circuit 140 (BK/PK). The reversing lamps share a common ground through circuit 57 (BK).

Normal Operation - Vehicles Equipped With TorqShift Transmission
The reversing lamp relay coil receives voltage from the PCM power relay through circuit 361 (RD). The reversing lamp relay coil ground is supplied and controlled by the PCM through circuit 1362 (DG/OG). Voltage is supplied to the reversing lamp relay switch side from the CJB fuse 12 (15A) through circuit 296 (WH/VT). When the transmission is placed in REVERSE (R), the PCM provides a ground for the reversing lamp relay coil, energizing the relay. When the reversing lamp relay is energized, the reversing lamp relay routes voltage to the reversing lamps through circuit 140 (BK/PK). The reversing lamps share a common ground through circuit 57 (BK).

- DTC P1910 (Reverse Lamp Control Circuit/Open) - sets when the PCM detects an open from the reversing lamps relay coil ground control circuit.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Digital TR sensor (if equipped with 4R75E transmission)
- Reversing lamp relay (if equipped with TorqShift transmission)
- PCM (if equipped with TorqShift transmission)

O1:

O1-O4:

O4-O6:

O7-O9:

O9-O10: