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 15 (BODY CONTROL MODULES)SYSTEM TESTSTEST B: RETAINED ACCESSORY POWER ON AFTER TIME-OUT
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Test B: Retained Accessory Power On After Time-Out
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test B: Retained Accessory Power On After Time-Out
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Perform Retained Accessory Power (RAP) system diagnostic system check. See RETAINED ACCESSORY POWER (RAP) SYSTEM DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. If Retained Accessory Power (RAP) system diagnostic system check has been performed, go to next step.
- Turn ignition switch to LOCK position. Remove RAP relay from left instrument panel fuse block. Operate power windows and sun roof (if equipped). If power windows and sun roof (if equipped) operate properly, go to next step. If power windows and sun roof (if equipped) doe not operate properly, go to step 4.
- Check for short to power in circuit between RAP relay connector in left instrument panel fuse block and suspect component. See WIRING DIAGRAMS . Repair as necessary and go to step 7.
- Connect a test light between ground and RAP relay connector terminal No. 707 in left instrument panel fuse block. See Figure. If test light illuminates, go to step 6. If test light does not illuminate, go to next step.
- Replace RAP relay and go to step 7.
- Replace and reprogram BCM. See BODY CONTROL MODULE under REMOVAL & INSTALLATION. See BODY CONTROL MODULE under PROGRAMMING. After repairs, go to next step.
- Check system operation. If system operates properly, system okay at this time. If system does not operate properly, 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.