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 281 (ELECTRICAL COMPONENT LOCATOR)CONTROL UNITS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Control Units
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Control Units
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Blower Motor Control Processor | Behind dash, at right front of blower motor assembly. See Figure . |
| Cruise Control Module | At left side of engine compartment, on strut tower. |
| Dash Integration Module | Behind dash, under right dash sound insulator. |
| Electronic Brake Control Module | Under air cleaner housing. See Figure . |
| HVAC Control Module | At center of dash, above radio. |
| Ignition Control Module (ICM) Front Bank | On top of left cam cover. |
| Ignition Control Module (ICM) Rear Bank | On top of right cam cover. See Figure . |
| Inflatable Restraint I/P Module | Under right side of instrument panel pad. |
| Inflatable Restraint Sensing & Diagnostic Module | Under center console, mounted to floorpan. |
| Instrument Panel Integration Module | At center of dash, behind heater & A/C controls. |
| Powertrain Control Module | At left side of engine compartment, under air cleaner. |
| Radio Antenna Module | At rear of headliner. |
| Rear Integration Module | Near upper left corner of rear shelf panel. |
| Remote Control Door Lock Receiver | Behind rear seat back. |
| Sun Roof Module | Above headliner, at rear of sun roof. |
| Theft Deterrent Control Module | Underside of dash, behind radio. |
| Theft Deterrent Exciter Module | Part of ignition switch assembly. |
| Turn Signal/Hazard Flasher Module | Behind left side of dash, above data link connector. |
| Vehicle Communication Unit | Behind rear seat back. |
| Vehicle Interface Unit | Behind rear seat back. |
RENDER: 1.0x
NO RELATED
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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.