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 543 (CHARGING SYSTEM)SYSTEM TESTSTEST B: CHARGE INDICATOR ALWAYS ON
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Test B: Charge Indicator Always On
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test B: Charge Indicator Always On
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, 2003 Chevrolet Blazer, and 2002 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.
- If diagnostic system check was not performed, perform 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. Observe charge indicator on Instrument Panel Cluster (IPC). If charge indicator illuminates, go to next step. If charge indicator does not illuminate, problem is intermittent. Check wiring and connections.
- Turn ignition switch to OFF position. Disconnect generator harness connector. Turn ignition switch to RUN position. If charge indicator remains illuminated, go to next step. If charge indicator does not remain illuminated, go to step 5.
- Test charge indicator control circuit for a short to ground. See WIRING DIAGRAMS . If problem exists, repair as necessary. After repair, go to step 7. If problem does not exist, go to step 6.
- Replace generator. See GENERATOR under REMOVAL & INSTALLATION. After repair, go to step 7.
- Replace Powertrain Control Module (PCM). See REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE. Program PCM. After repair, go to next step.
- Operate system to verify repair. If system is not operating correctly, repeat test beginning at 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.