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 287 (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 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Body Control Module | Behind left side of dash, left of steering column. |
| Coolant Level Module | On right side of radiator. |
| Cruise Control Module | Front of left strut tower. |
| Daytime Running Lamps (DRL) Control Module | Behind left side of dash. See Figure . |
| Driver Seat Heater Control Module | Below right side of driver's seat, mounted on seat track. |
| Electronic Brake Control Module | Left side of engine compartment, part of brake pressure modulator valve. |
| HVAC Control Module | Center of dash. |
| Ignition Control Module (ICM) (3.1L VIN J) | Top right side of engine. See Figure . |
| Ignition Control Module (ICM) (3.8L VIN K) | Top left front of engine. See Figure . |
| Ignition Control Module (ICM) (3.8L VIN 1) | Top left front of engine. See Figure . |
| Inflatable Restraint Sensing & Diagnostic Module | Under right front seat. |
| Powertrain Control Module | Left front side of engine compartment, in air cleaner assembly. |
| Remote Control Door Lock Receiver | Behind right side of dash. |
| Sun Roof Module | Front center of sun roof module. |
| Theft Deterrent Control Module | Part of ignition key cylinder. |
| Vehicle Communications Unit | In trunk, on left wheelwell. |
| Vehicle Interface Unit | In trunk, on left wheelwell. |
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.