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 1428 (SUNROOF SYSTEM)REPAIR INSTRUCTIONSSUNROOF MODULE ASSEMBLY REPLACEMENT (OLD STYLE PEZ)INSTALLATION 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.

Install the sunroof sunshade panel to the sunroof module assembly. Refer to Sunroof Sunshade Panel Replacement .
Install the sunroof window to the sunroof module assembly. Refer to Sunroof Window Replacement .
Install the sunroof motor/actuator to the sunroof module assembly. Refer to Sunroof Motor/Actuator Replacement (Old Style PEZ) or Sunroof Motor/Actuator Replacement (New Style MD4) .

Fig 1: Identifying Sunroof Module Assembly (Old Style PEZ)

Courtesy of GENERAL MOTORS CORP.

Position the sunroof module assembly to the vehicle with an assistant.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the bolts that retain the sunroof module assembly to the roof panel.
Tighten: Tighten the bolts to 10 N.m (7 lb ft).
Connect the drain hoses to the sunroof module assembly. Refer to the following procedures:
- Sunroof Drain Hose Replacement - Front
- Sunroof Drain Hose Replacement - Rear

Fig 2: Accessing Sunroof Assembly Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Connect the sunroof harness electrical connector.
Install the headliner. Refer to Headliner Replacement (TrailBlazer, Envoy, Bravada) , Headliner Replacement (TrailBlazer EXT, Envoy XL) or Headliner Replacement (Envoy XUV) in Interior Trim.
Perform the Initialization/Teach Procedure. Refer to Sunroof Motor/Actuator Initilization/Teach Process (New Motor) or Sunroof Motor/Actuator Initilization/Teach Process (Existing Motor) .

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.