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 SYSTEMDRIVER INFORMATION CENTER DIAGNOSTIC SYSTEM CHECK
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Driver Information Center Diagnostic System Check
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Driver Information Center 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 Driver Door Module (DDM), Dash Integration Module (DIM), Electronic Brake Control Module (EBCM), Instrument Panel Cluster (IPC), Powertrain Control Module (PCM), Rear Integration Module (RIM), Sensing and Diagnostic Module (SDM) and Theft Deterrent Controller (TDC) module. If scan tool communicates with DDM, DIM, EBCM, IPC, PCM, SDM and TDC module, go to next step. If scan tool does not communicate with DDM, DIM, EBCM, IPC, PCM, SDM and TDC module, perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Using scan tool, access CLASS 2 POWER MODE. Cycle ignition switch through all positions while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform TEST C: POWER MODE MISMATCH under SYSTEM TESTS.
- Using scan tool, select DISPLAY DTCs function for DDM, DIM, EBCM, IPC, PCM, SDM and TDC module. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair DIC system by symptom. See INSTRUMENT PANELS - AURORA article.
- If scan tool does not display any DTCs which begin with "U", perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . 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.
CAUTION:
Engine may start. Turn ignition switch to OFF position as soon as you have observed crank power mode.
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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.