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 1517 (SHIFT INTERLOCK SYSTEM)REPAIR INSTRUCTIONSAUTOMATIC TRANSMISSION SHIFT LOCK ACTUATOR REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Solenoid Plunger & Shift Control Pivot Arm Stud

Courtesy of GENERAL MOTORS CORP.

Insert the automatic transmission shift lock actuator lower clip attachment just above the installed position on the shift control pivot arm.
Twist and press the automatic transmission shift lock actuator upper clip attachment onto the pivot point.
Begin to install the top of the upper clip attachment, then pivot the attachment downward while pressing to secure.

Fig 2: Automatic Transmission Shift Lock Actuator Lower Clip

Courtesy of GENERAL MOTORS CORP.

Position the automatic transmission shift lock actuator lower clip attachment onto the shift control pivot arm stud and push to secure.

Fig 3: Automatic Transmission Shift Lock Control Actuator Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Connect the automatic transmission shift lock actuator electrical connector.

Fig 4: I/P Wiring Harness Clip & Floor Shift Control

Courtesy of GENERAL MOTORS CORP.

Install the shift control boot. Refer to Floor Shift Control Boot Replacement .
Connect the I/P wiring harness clip to the shift control.
Connect the floor shift control electrical connector.
Install the I/P accessory trim plate. Refer to Trim Plate Replacement - Instrument Panel (I/P) Accessory in Instrument Panel, Gages and Console.
Install the console. Refer to Console Replacement in Instrument Panel, Gages and Console.

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.