5 Repairing Back-Up Lamp Problems

Part 1 Of 7:

Part 2 Of 7:

Part 3 Of 7:

Part 4 Of 7:

Part 5 Of 7:

Part 6 Of 7:

Part 7 Of 7:

THEORY OF OPERATION:
In 1989-96 MY vehicles, the back-up lamps are activated through a relay controlled by the Park/Neutral Position Switch, PRNDL Switch, and the Transmission Control Module (TCM). When the gearshift selector is in the Reverse position, the Back-Up Lamp Relay is energized, activating the back-up lamps. In 1996-98 MY vehicles, the back-up lamps are activated through the Transmission Range Sensor (TRS). The Park/Neutral Position Switch, PRNDL Switch, and Back-Up Lamp Relay have been replaced by the Transmission Range Range Sensor (TRS). The back-up lamps are directly activated by the TRS.

LIMP-IN:
NO

WHEN MONITORED/SET CONDITIONS:
Normal operation continues when this problem occurs.

POSSIBLE CAUSES:
- Short or open in the back-up lamp circuit
- Defective back-up lamp bulb(s)
- Gearshift linkage out of adjustment
- Defective back-up lamp relay (1989-95 MY vehicles)
- Blown back-up lamp circuit fuse