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 286 (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 Chevrolet Corvette. 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 right side of dash. See Figure . |
| Body Control Module | Mounted on toe board, in right footwell. |
| BOSE Signal Processor | Under left side of dash, above accelerator pedal. |
| Driver Door Module | In lower center of respective door. |
| Driver Seat Control Module | On underside of driver's seat. See Figure . |
| Electronic Brake Control Module | At left front side of engine compartment, on frame rail. |
| Electronic Suspension Control (ESC) Module | In rear compartment, inside left storage compartment. See Figure . |
| Headlamp Door Control Module | In lower right front of engine compartment. See Figure . |
| HVAC Control Module | Center of dash, under radio. |
| Ignition Coil Module (8) | On valve covers, at top of respective cylinders. See Figure . |
| Inflatable Restraint Instrument Panel Module | At right side of dash. |
| Inflatable Restraint Sensing & Diagnostic Module | Below center of dash, under HVAC control head. See Figure . |
| Passenger Door Module | Bottom center of door, rear of speaker. |
| Powertrain Control Module (PCM) | Behind right front fender, between wheelhouse & dash panel. See Figure . |
| Radio Antenna Module (Coupe) | Behind lower "B" pillar trim panel. |
| Remote Control Door Lock Receiver | On left side of rear compartment. |
| Throttle Actuator Control Module | On PCM, below battery. |
| Vacuum Control Assembly | On right side of HVAC unit, right of blower motor. |
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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.