Backup Lamps Inoperative
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Backup Lamps Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Exterior Lights Schematics | |||
| 1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems |
| 2 | Verify that the backup lamps are inoperative. Do the backup lamps operate normally? |
Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems | Go to Step 3 |
| 3 | Is only one backup lamp inoperative? | Go to Step 6 | Go to Step 4 |
| 4 | Does this vehcle have a manual transmission? | Go to Step 7 | Go to Step 5 |
| 5 | Use the scan tool to check if DTC P0705 is set in the current or history Powertrain DTC Information. Is DTC P0705 present? |
Go to DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT in Automatic Transmission - 4L60 - E | Go to Step 8 |
| 6 | Test the backup lamp supply voltage and ground circuit for an open or high resistance. Refer to CIRCUIT TESTING
and WIRING REPAIRS
in Wiring Systems. Did you find and correct a condition? |
Go to Step 14 | Go to Step 11 |
| 7 |
|
Go to Step 10 | Go to Step 8 |
| 8 | Test the following circuits for a short to ground, open or high resistance. Refer to CIRCUIT TESTING
and WIRING REPAIRS
in Wiring Systems.
Did you find and correct the condition? |
Go to Step 14 | Go to Step 9 |
| 9 | Inspect for poor connections at the harness connector of the Body Control Module (BCM). Refer to CIRCUIT TESTING
and WIRING REPAIRS
in Wiring Systems. Did you find and correct the condition? |
Go to Step 14 | Go to Step 12 |
| 10 | Inspect for poor connections at the harness connector of the backup lamp switch. Refer to CIRCUIT TESTING
and WIRING REPAIRS
in Wiring Systems. Did you find and correct the condition? |
Go to Step 14 | Go to Step 13 |
| 11 | Replace the affected backup lamp bulb. Did you complete the replacement? |
Go to Step 14 | - |
| 12 |
IMPORTANT:
Perform the setup procedure for the BCM. Replace the body control module (BCM). Refer to BODY CONTROL MODULE REPLACEMENT
in Body Control System.Did you complete the replacement? |
Go to Step 14 | - |
| 13 | Adjust or replace the backup lamp switch. Did you complete the repair? |
Go to Step 14 | - |
| 14 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |