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 INSTRUCTIONSIGNITION SWITCH REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

IMPORTANT: Before installing a new ignition switch, the lock cylinder gear has to be rotated counterclockwise until it hits the stop. Counterclockwise from the drivers perspective. In order to rotate the lock cylinder all the way the key and lock cylinder need to be removed. Once the key and lock cylinder are removed, rotate counterclockwise with a screw driver.

Install the ignition lock cylinder case (1) and slide the ignition switch (2) in.

Fig 1: Installing Ignition Switch
Courtesy of GENERAL MOTORS CORP.
Push the key alarm connector (1) into the ignition lock cylinder case (2).
Rotate the key alarm connector (1) 90 degrees so that the key alarm connector (1) locks into place.
Install the passkey connector into the ignition lock cylinder case (2).

Fig 2: Installing Key Alarm Connector To Ignition Lock Cylinder Case
Courtesy of GENERAL MOTORS CORP.
Slide the 2 connectors (2) of the turn signal and multifunction switch assembly into the bulkhead connector (1).

Fig 3: Installing Turn Signal & Multifunction Switch Assembly Connector To Bulkhead Connector
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.