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 266 (BODY CONTROL MODULES)SELF-DIAGNOSTIC SYSTEMRETAINED ACCESSORY POWER DIAGNOSTIC SYSTEM CHECK
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Retained Accessory Power Diagnostic System Check
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Retained Accessory Power Diagnostic System Check
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- Connect scan tool to Data Link Connector (DLC). DLC is located below driver side of instrument panel, near steering column. If scan tool powers up, go to next step. If scan tool does not power up, perform TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
- Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Dash Integration Module (DIM) and Rear Integration Module (RIM). See CLASS 2 SERIAL DATA LINE under DESCRIPTION & OPERATION. If scan tool communicates with DIM and RIM, go to next step. If scan tool does not communicate with DIM and RIM, perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Using scan tool, select DISPLAY DTCs for DIM and RIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair retained accessory power by symptom. See SYSTEM TESTS .
- If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- If scan tool displays DTC B1327, perform appropriate test. See DTC B1327: BATTERY/SOURCE VOLTAGE LOW under DIAGNOSTIC TESTS in GENERATORS & REGULATORS - AURORA article in ELECTRICAL. If scan tool displays any other DTC, perform appropriate. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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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.