Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test Description
2006 Isuzu Ascender S, 5.3 M, 4WDSECTION 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.
- 4: This step tests for a shorted stop lamp switch.
- 5: This step tests for an open stop lamp switch.
DTC C0281 Diagnostic Test
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: ABS Schematics | |||
| 1 | Did you perform the antilock brake system (ABS) Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - ABS |
| 2 |
|
Go to Step 3 | Go to Step 5 |
| 3 |
|
Go to Diagnostic Aids | Go to Step 4 |
| 4 |
|
Go to Step 9 | Go to Step 7 |
| 5 |
|
Go to Step 9 | Go to Step 6 |
| 6 | Test the ignition 3 voltage circuit and the TCC brake switch signal circuit for an open or a short to ground. Refer to Circuit Testing
and to Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 8 |
| 7 | Test the TCC brake switch signal circuit for a short to voltage. Refer to Circuit Testing
and to Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 8 |
| 8 | Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections
and to Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 10 |
| 9 | Inspect for poor connections at the harness connector of the stop lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections
and to Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 11 |
| 10 |
IMPORTANT:
Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement .Did you complete the replacement? |
Go to Step 12 | - |
| 11 | Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement
in Lighting Systems. Did you complete the replacement? |
Go to Step 12 | - |
| 12 |
|
Go to Step 2 | System OK |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.