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.
Retrieving Diagnostic Trouble Codes
Connect scan tool to Data Link Connector (DLC). See COMPONENT LOCATIONS . Using scan tool, attempt to establish communication with Body Control Module (BCM). Check for any Diagnostic Trouble Codes (DTC) stored in BCM memory which may lead to misdiagnosis of rear defogger system. If scan tool does not communicate with BCM, see appropriate BODY CONTROL MODULES article. If any defogger system related DTCs are stored in BCM memory, perform appropriate test. See DIAGNOSTIC TROUBLE CODE INDEX table. If no defogger system related DTCs exist in BCM memory, repair by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
| DTC | Description |
|---|---|
| B0285 | Rear Defogger Circuit Low |
| B0286 | Rear Defogger Circuit High |
NO RELATED
Use the Manual With the Right Hardware
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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.