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 77 (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 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Coolant Level Module (6.5L VIN F) | Behind left side of dash. |
| Cruise Control Module (CCM) | Near brake master cylinder. |
| Daytime Running Light (DRL) Control Module | Under left side of dash, taped to dash harness. See Figure . |
| Door Lock Control Module | Behind left kick panel. |
| Electronic Brake Control Module (EBCM) | On left frame rail, near center of vehicle. |
| Front Auxiliary HVAC Control Assembly | On front of overhead console. |
| Fuel Sender Buffer Module | Below right side of dash, near knee bolster. |
| Fuel Solenoid Driver (6.5L VIN F) | On left side of fuel injection pump. See Figure . |
| HVAC Control Processor (Auxiliary) | On front interior roof panel. |
| Ignition Control Module (ICM) (4.3L VIN W) | On top right side of engine, at ignition coil. |
| Ignition Control Module (ICM) (5.0L VIN M) | On top right side of engine, at ignition coil. See Figure . |
| Ignition Control Module (ICM) (5.7L VIN R) | On top right side of engine, at ignition coil. See Figure . |
| Illuminated Entry Module | Below center of dash. |
| Inflatable Restraint I/P Module | In right side of dash. |
| Inflatable Restraint Sensing & Diagnostic Module | Under left front seat. |
| Inflatable Restraint Steering Wheel Module | In center of steering wheel. |
| Interior Lamp Control Module | Below center of dash. |
| Multi-Function Alarm Module | Under left side of dash. |
| Passlock Module | Below center of dash. |
| Power Brake (P/B) Booster Fluid Flow Delay Module | Under left side of dash. |
| Powertrain Control Module (PCM) (4.3L VIN W) | In engine compartment, on left inner fender. See Figure . |
| Powertrain Control Module (PCM) (5.0L VIN M) | In engine compartment, on left inner fender. See Figure . |
| Powertrain Control Module (PCM) (5.7L VIN R) | In engine compartment, on left inner fender. See Figure . |
| Powertrain Control Module (PCM) (6.5L VIN F) | Behind center of dash. See Figure . |
| Powertrain Control Module (PCM) (8.1L VIN G) | In engine compartment, on left inner fender. See Figure . |
| Remote Control Door Lock Receiver (RCDLR) | Behind center of dash. |
| RSA-T Module | Behind rear of driver's door, behind interior panel. |
| Throttle Actuator Control (TAC) Module (8.1L VIN G) | At left rear of engine compartment, on firewall. |
| Vehicle Immobilizer Module (VIM) | Behind center of dash. |
RENDER: 1.0x
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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.