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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1255 (THEFT DETERRENT SYSTEM)REPAIR INSTRUCTIONSTHEFT DETERRENT CONTROL MODULE 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 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Install the theft deterrent control module (2) onto the ignition lock cylinder case assembly (1).
CAUTION: Refer to SIR INFLATOR MODULE COIL CAUTION in Cautions and Notices.
Connect the connector to the theft deterrent control module.
If necessary, connect the connector to the ignition lock cylinder case.
Install the lock cylinder. Refer to IGNITION LOCK CYLINDER REPLACEMENT in Steering Wheel and Column.
Install the upper and lower trim covers. Refer to STEERING COLUMN TRIM COVERS REPLACEMENT in Steering Wheel and Column.
Enable the SIR system. Refer to DISABLING & ACTIVATING AIR BAG SYSTEM in SIR.
Program the theft deterrent control module. Refer to PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS .

Fig 1: Installing Theft Deterrent Control Module Onto Ignition Lock Cylinder Case Assembly
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.