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 1397 (CELLULAR COMMUNICATION SYSTEM)REPAIR INSTRUCTIONSONSTAR MICROPHONE REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

If installation of the mounting bracket is required, install the mounting bracket to the overhead console.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the 2 OnStar® microphone retaining screws.
Tighten: Tighten the screws to 0.8 N.m (7 lb in).
Install the microphone to the mounting bracket ensuring the quick release tab (1) is fully seated.

Fig 1: Locating Quick Release Tab
Courtesy of GENERAL MOTORS CORP.

Fig 2: Connecting OnStar® microphone Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Connect the electrical connector to the OnStar® microphone (1).
Install the overhead console. Refer to Console Replacement - Overhead (TrailBlazer, Envoy, Bravada) or Console Replacement - Overhead (Envoy XUV) in Interior Trim.

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.