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 DIAGNOSISSTEERINGSTEERING WHEEL & STEERING COLUMNREPAIR INSTRUCTIONSSTEERING COLUMN WIRE HARNESS ASSEMBLY REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

If the steering wheel has steering wheel controls, install the SIR coil. Refer to SIR COIL ASSEMBLY in Air Bag Restraint Systems.
Connect all of the connectors from the new wire harness assembly.

Fig 1: Connecting Connectors Attached To Wire Harness Assembly
Courtesy of GENERAL MOTORS CORP.
Push the key alarm connector (1) into the ignition lock cylinder case assembly (2).
Rotate the key alarm connector (1) 90 degrees so that the key alarm connector (1) locks into place.
Install the steering wheel theft deterrent lock.
Refer to STEERING WHEEL THEFT DETERRENT LOCK REPLACEMENT .

CAUTION: Refer to SIR INFLATOR MODULE COIL CAUTION In Cautions and Notices.
Install the wires back into the ignition switch clip (located on the side of the ignition switch).

Fig 2: Installing Key Alarm Connector To Ignition Lock Cylinder Case Assembly
Courtesy of GENERAL MOTORS CORP.
Install the wire harness strap.
Install the upper and lower trim covers. Refer to STEERING COLUMN TRIM COVERS REPLACEMENT .
Enable the SIR system. Refer to DISABLING & ACTIVATING AIR BAG SYSTEM in Air Bag Restraint Systems.

Fig 3: Installing Wire Harness Strap
Courtesy of GENERAL MOTORS CORP.

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.