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.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 531 (CHARGING SYSTEM)SYSTEM TESTSTEST C: CHARGE INDICATOR INOPERATIVE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Test C: Charge Indicator Inoperative
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test C: Charge Indicator Inoperative
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- If diagnostic system check was not performed, go to ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. If diagnostic system check was performed, go to next step.
- Turn ignition switch to RUN position. If charge indicator light illuminates, problem is intermittent. Check wiring and connections. If charge indicator light does not illuminate, go to next step.
- Connect scan tool to Data Link Connector (DLC). DLC is located under instrument panel, near steering column. Using scan tool, observe Generator light parameter in PCM data list. If Generator light parameter is ON, go to step 6 . If Generator light parameter is not ON, go to next step.
- Start engine. Using scan tool, command charge indicator light ON. If charge indicator light illuminates, go to step 6 . If charge indicator light does not illuminate, go to next step.
- Test charge indicator light control circuit for high resistance or an open. Repair circuit as necessary, then go to step 10 . If open or high resistance was not found, go to step 7 .
- Inspect PCM harness connector for poor connections. Repair as necessary, then go to step 10 . If connections are okay, go to step 8 .
- Inspect IPC harness connector for poor connections. Repair as necessary, then go to step 10 . If connections are okay, go to step 9 .
- Replace PCM. After replacement, reprogram PCM. See REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. Go to next step.
- Replace IPC. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Go to next step.
- Operate system for which symptom occurred. If condition was found and corrected, system is okay. If condition was not found and corrected, go to step 2 .
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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.