Ignition Lock Cylinder

This article updated with TSB 02-02-35-001.

IGNITION LOCK CYLINDER REPLACEMENT - ON VEHICLE

REMOVAL PROCEDURE

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

For Vehicles equipped with OnStar (UE1) with Back Up Battery:
The Back Up Battery is a redundant power supply to allow limited OnStar functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar module). Do not disconnect the main vehicle battery or remove the OnStar fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar module in any way while the ignition is On or with RAP activated may cause activation of the OnStar Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.

1. Disconnect the negative battery cable.

Caution: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to Disabling the SIR System. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

2. Disable the SIR system. Disabling
3. Lower the knee bolster.
4. Remove the steering column trim covers. Steering Column Trim Covers
5. Use the key in order to turn the ignition lock cylinder to the START position.





6. Install an allen wrench into the hole on top of the lock cylinder housing.
Push down on the allen wrench in order to release the tab on the lock cylinder inside the lock cylinder housing.
7. Slide the lock cylinder out of the lock cylinder housing.





Installation Procedure

IMPORTANT: The gears between the ignition switch and the lock cylinder housing must be in the correct position. Failure to do so will cause a misalignment of the gears in the ignition switch and the lock cylinder housing, which may result in a NO START or BATTERY DRAIN.





1. Use a screwdriver to rotate the lock cylinder housing gear clockwise to the start position.
2. Remove the screwdriver an allow trhe lock cylinder housing gear to spring return to the RUN position.





3. Install the key into the lock cylinder.
4. Align and install the lock cylinder into the lock cylinder housing.
5. Install the steering column trim covers. Steering Column Trim Covers
6. Install the knee bolster.
7. Enable the SIR system. Enabling
7. Connect the negative battery cable.
8. Perform the PASSLOCK learn procedure. Theft Deterrent - Programming Components
With Immobilizer