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 98 (CHARGING SYSTEM)SYSTEM TESTSTEST B: CHARGE INDICATOR LIGHT ALWAYS ON
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Test B: Charge Indicator Light Always On
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test B: Charge Indicator Light Always On
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- If engine electrical diagnostic system check was performed, go to next step. If engine electrical diagnostic system check was not performed, go to ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition switch to RUN position. Observe charge indicator light on Instrument Panel Cluster (IPC). If charge indicator light illuminates, go to next step. If charge indicator light does not illuminate, concern may be intermittent. Check wiring and connections, see WIRING DIAGRAMS .
- Turn ignition switch to OFF position. Disconnect 4-pin generator harness connector. Turn ignition switch to RUN position. If charge indicator light remains illuminated, go to next step. If charge indicator light does not remain illuminated, go to step 5 .
- Test charge indicator control circuit for short to ground. See WIRING DIAGRAMS . If problem exists, repair circuit as necessary and go to step 7 . If no problem exists, go to step 6 .
- Replace generator. See GENERATOR under REMOVAL & INSTALLATION. After repairs are made, go to step 7 .
- Replace PCM. After replacement, reprogram PCM. SeePOWERTRAIN CONTROL MODULE/VEHICLE CONTROL MODULE under REMOVAL & INSTALLATION in BODY CONTROL MODULES - CHEVY EXPRESS & SAVANNA article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. After repairs are made, go to next step.
- Retest system to verify repair. If condition was found and corrected, system is okay. If condition was not found, go to step 3 .
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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.