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 288 (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 GMC Sierra and 2003 Chevrolet Silverado. 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, on HVAC assembly. |
| Body Control Module | On lower left side of dash, below steering column. |
| Cruise Control Module | In left rear of engine compartment, on firewall. |
| Driver Door Module | Behind driver's door trim panel, below switch assembly. |
| Electronic Brake Control Module | On left side of inner frame. |
| Engine Control Module (6.6L) | At left front of engine compartment. |
| Front Passenger Door Module | Behind front passenger's door trim panel, below switch assembly. |
| Fuel Injector Control Module (6.6L VIN 1) | Under engine air intake duct. |
| HVAC Control Module | Behind center of dash. |
| Ignition Control Module (4.3L) | At right rear of engine, near ground strap. |
| Inflatable Restraint I/P Module | Behind right side of dash. |
| Inflatable Restraint Sensing/Diagnostic Module | Under left front seat. |
| Memory Seat Module | Underside of left front seat. |
| Powertrain Control Module (PCM) | On left front of engine compartment. See Figure. |
| Rear Wheel Steering Control Module | At left rear of vehicle, near spare tire bracket. |
| Throttle Actuator Control Module (Except 4.3L) | At left rear of engine compartment. |
| Transfer Case Shift Control Module | Behind headlamp switch. |
| Transmission Control Module | At left front of engine compartment. |
| Vehicle Communication Interface Module | Behind passenger air bag module. |
| Windshield Wiper Motor Module | Under windshield cowl, between wiper arms. |
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.