Backup Lamps Inoperative
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. 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 Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Verify that the backup lamps are inoperative. Do the backup lamps operate normally? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | Is only one backup lamp inoperative? | Go to Step 5 | Go to Step 4 |
| 4 | Use the scan tool to check if there are any codes set in the current or history Powertrain DTC Information. Are any codes present? |
Go to Diagnostic System Check - Vehicle | Go to Step 6 |
| 5 | Test the backup lamp supply voltage and ground circuit for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct a condition? |
Go to Step 10 | Go to Step 8 |
| 6 | Test the following circuits for an open, high resistance, or a short to ground. Refer to Circuit Testing
and Wiring Repairs
.
Did you find and correct a condition? |
Go to Step 10 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 10 | Go to Step 9 |
| 8 | Replace the affected backup lamp bulb. Refer to Tail Lamp Bulb Replacement (Cadillac) or Tail Lamp Bulb Replacement (Tahoe, Avalanche) or Tail Lamp Bulb Replacement (Yukon) . Did you complete the replacement? |
Go to Step 10 | - |
| 9 | Replace the BCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 10 | - |
| 10 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |