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 1756 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESUNABLE TO CONTACT ONSTAR CALL CENTERCOMPONENT TESTING
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Component Testing
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Component Testing
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length or coax.
- Verify that there is no exterior damage to the cellular antenna.
- If damaged, test or replace the cellular antenna assembly.
- Disconnect the cellular antenna coax from the VCIM.
- Disconnect the cellular antenna coax from the cellular antenna.
- Test for infinite resistance between the center conductor of the coax and the outer metal shield.
- If different than specified value, replace the cellular antenna coax.
- Test for less than 1 ohm resistance at the cellular antenna coax center conductor from end to end.
- If greater than specified value, replace the cellular antenna coax cable.
- Use the scan tool to access the STID, ESN and Transceiver I.D. and contact the General Motors Technical Assistance Center.
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.