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)DIAGNOSTIC TESTSDTC B1004: KEEP ALIVE MEMORYTEST PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Test Procedure
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Procedure
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.
- If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM.
- Connect scan tool to Data Link Connector (DLC). DLC is located below driver side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, retrieve DTCs. If DTC B1004 is retrieved as current, go to next step. If DTC B1004 is not retrieved as current, see DIAGNOSTIC AIDS .
- Replace control module. Program control module, if necessary. See PROGRAMMING . After repair, go to next step.
- Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See CODE ENABLE CRITERIA . If DTC resets, repeat test beginning at 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.