Test Description
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step test determines if an open or short to ground exists.
- 3: This step test determines if a short to ground exists in the lamp wiring or internally within the BCM.
- 4: This step test determines if an open exists in the body wiring harness extension harness or internally within the BCM.
- 8: After replacement of the BCM you must calibrate the new module for proper operation.
DTC B1480 Diagnostic Test
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Interior Lights Schematics Connector End View Reference: Lighting Systems Connector End Views or Body Control System Connector End Views in Body Control System |
|||
| 1 | Did you perform the Lighting System Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems |
| 2 | Inspect the TBC 4 fuse in the rear fuse block. Is the fuse good? |
Go to Step 4 | Go to Step 3 |
| 3 | Test the inadvertent power courtesy lamps supply voltage circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | Go to Step 5 |
| 4 | Test the TBC 4 battery positive supply voltage circuit at the body wiring harness extension harness connector at the body control module (BCM) for battery voltage. Refer to Circuit Testing
in Wiring Systems. Is battery voltage present? |
Go to Step 5 | Go to Step 6 |
| 5 | Inspect for poor connections at the harness connectors of the BCM. Refer toTesting for Intermittent Conditions and Poor Connections
andConnector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | Go to Step 8 |
| 6 | Inspect for poor connections at the body wiring harness extension harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | Go to Step 7 |
| 7 | Replace the body wiring harness extension harness to the BCM. Refer to Body Wiring Harness Extension Replacement - BCM
in Body Control System. Did you complete the replacement? |
Go to Step 9 | - |
| 8 |
IMPORTANT:
Perform the setup procedure for the BCM. Replace the BCM. Refer to Body Control Module Replacement
in Body Control System.Did you complete the replacement? |
Go to Step 9 | - |
| 9 |
|
Go to Step 2 | System OK |