Diagnosis And Testing - Backup Lamp Switch
- Disconnect and isolate the battery negative cable.
- Locate and disconnect the wire harness connector from the backup lamp switch.
- Check for continuity between the two terminal pins in the backup lamp switch.
- With the gear selector lever in the R everse position, there should be continuity.
- With the gear selector lever in any position other than R everse, there should be no continuity.
- If the switch fails either of these two continuity tests, replace the ineffective backup lamp switch.