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 15 (BODY CONTROL MODULES)REMOVAL & INSTALLATIONVEHICLE INTERFACE UNITREMOVAL
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Vehicle Interface Unit: Removal
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Open rear compartment. Remove cover from OnStar® Vehicle Communication Unit (VCU) by depressing retainer tabs. Remove cellular coaxial cable from VCU by pulling off. Remove screws from connector. Remove connector from VCU. Release retainer strap from VCU using a small flat-bladed tool. Remove VCU from rear compartment.
- Remove nuts from VIU/VCU bracket. Remove VIU from inner wheel housing. Disconnect Global Positioning System (GPS) antenna cable from VIU.
- Disconnect red 32-pin connector from VIU. Disconnect blue 32-pin connector from VIU. Remove mounting screws from VIU. Remove VIU from VIU/VCU bracket.
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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.