Labor
Replace0.5 hr
Procedures
Backup Lamp Switch: Testing and Inspection
- Disconnect and isolate the battery negative cable.
- Raise and support the vehicle.
- Locate and disconnect the engine wire harness connector from the backup lamp switch connector receptacle.
- Check for continuity between the two terminal pins in the backup lamp switch connector receptacle. a.With the gear selector lever in the REVERSE position, there should be continuity. b.With the gear selector lever in any position other than REVERSE, there should be no continuity.
- If the switch fails either of these two continuity tests, replace the ineffective backup lamp switch.
Backup Lamp Switch - Description
DESCRIPTION Vehicles equipped with a manual transmission (1) have a normally open, spring-loaded plunger type backup lamp switch (2). Vehicles with an optional electronic automatic transmission have a Transmission Range Sensor (TRS) that is used to perform several functions, including that of the backup lamp switch. The TRS is described in further detail elsewhere in this service information. Refer to the service and diagnostic information for the automatic transmission type installed in the vehicle. The backup lamp switch is located in a threaded hole on the side of the manual transmission housing. The switch has a threaded body and a hex formation near the plunger end of the switch. An integral connector receptacle at the end of the switch opposite the plunger connects the switch to the vehicle electrical system through a take out and connector of the engine wire harness. When installed, only the switch connector and the hex formation are visible on the outside of the transmission housing. The backup lamp switch cannot be adjusted or repaired and, if ineffective or damaged, the entire switch unit must be replaced.