Installation Procedure

Slide the reader/exciter (4) onto the ignition lock cylinder.
Install the ignition lock cylinder light pipe (2) to the ignition cylinder (1).
Install the ignition cylinder bezel to the ignition lock cylinder, and engage the retainers.
If the ignition lock cylinder was previously seized, proceed with the following steps:
1. 4.1. Turn the ignition switch to the RUN position.
2. 4.2. Install the ignition switch to the IP.
3. 4.3. Connect the ignition switch electrical connectors.
4. 4.4. Install the knee bolster. Refer to Knee Bolster Replacement
5. 4.5. Turn the new ignition lock cylinder to the RUN position.
6. 4.6. Push the ignition lock cylinder into the ignition switch until fully seated. It may be necessary to slightly depress the release button as it passes by the 1/4 inch hole drilled in the switch housing.
7. 4.7. Go to step 6.
Fig 1: Ignition Lock Cylinder, Light Pipe & Reader/Exciter
Courtesy of GENERAL MOTORS CORP.
With the ignition key installed in the ignition lock cylinder (1) and the ignition lock cylinder in RUN, insert the ignition lock cylinder (1) into the IP opening (2).
The lock cylinder release button (3) will produce an audible click, when fully engaged.
Using light force, pull on the lock cylinder in order to ensure the lock cylinder is engaged.
Turn the ignition to LOCK, then remove the ignition key.
Install the radio. Refer to RADIO REPLACEMENT (U1R, UL6, UM5, UM9) or RADIO REPLACEMENT (U3Q, U3R, U3S) .
Release the parking brake.
Connect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PRO .
Inspect the ignition cylinder and switch for proper operation in all positions.
Enable the SIR system. Refer to ACTIVATING SYSTEM

Fig 2: Lock Cylinder Release Button & Components
Courtesy of GENERAL MOTORS CORP.