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 485 (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 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Accessory AC/DC Power Control Module | Under driver's seat. See Figure . |
| Auxiliary Intake Air Control | At left side of engine compartment, attached to front of air cleaner assembly. |
| Cruise Control Module | Behind left side of dash, at top side of steering column support bracket. See Figure . |
| Daytime Running Lamps (DRL) Control Module | At right side of steering column, above brake pedal. |
| Door Control Module | At right "D" pillar. See Figure . |
| Electronic Brake Control Module (1.8L LNK) | At right side of engine compartment. See Figure . |
| Electronic Brake Control Module (1.8L LV6) | At right side of engine compartment. |
| Engine Control Module | Behind right side of dash. See Figure . |
| Inflatable Restraint IP Module | At top right of dash. See Figure . |
| Inflatable Restraint Sensing & Diagnostic Module (SDM) | At front center of console, below shifter assembly. See Figure . |
| Inflatable Restraint Side Impact Module - Left | At base of left "B" pillar. See Figure . |
| Inflatable Restraint Side Impact Module - Right | At base of right "B" pillar. See Figure . |
| Inflatable Restraint Steering Wheel Module | In steering wheel. See Figure . |
| Multifunction Alarm Module | Behind left side of dash, mounted to dash fuse block. See Figure . |
| Powertrain Control Module (PCM) | Behind right side of dash. See Figure . |
| Shift Lock Electronic Control Unit | Under center console, attached to right side of shift lever. See Figure . |
| Sunroof Control Module | At front center of roof headliner. |
| Theft Deterrent Control Module | Behind right side of dash. See Figure . |
| TVIP ECU | Behind right end of dash. See Figure . |
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.