Diagnostic Aids
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.
- The following may cause an intermittent:
- A damaged terminal
- A backed out terminal
- A poor terminal tension
- A chafed wire
- A broken wire inside the insulation
- When diagnosing an intermittent short or an open, manipulate the wire harness while watching the test equipment for changes.
DTC B1420
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Body Control System Schematics Connector End View Reference: Body Control System Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check for the system exhibiting the symptom? | - | Go to Step 2 | Go to Control Module References |
| 2 |
|
9.0-16.0 V | Go to Step 3 | Go to Step 4 |
| 3 | Is the DTC set as a current DTC? | - | Go to Step 7 | Go to Diagnostic Aids |
| 4 |
|
9.0-16.0 V | Go to Step 6 | Go to Step 5 |
| 5 | Test the battery positive voltage circuit for a short to ground or an open. Refer to Circuit Description. Did you find and correct the condition? |
- | Go to Step 9 | Go to BATTERY INSPECTION/TEST (NON-HP2) in Engine Electrical |
| 6 | Test the all of ground circuits of the BCM for an open or high resistance. Did you find and correct the condition? |
- | Go to Step 9 | Go to Step 7 |
| 7 | Inspect for poor connections at the module 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 8 |
| 8 |
IMPORTANT:
Perform the module programming or setup procedure if required. Replace the BCM. Refer to Body Control Module Replacement .Did you complete the replacement? |
- | Go to Step 9 | - |
| 9 | Operate the system in order to verify the repair. Did you find and correct the condition? |
- | System OK | Go to Step 2 |