Hate to tell you this, but you have to take the steering column apart. under the horn there's a bolt, but you need a special tool to put it back on... took me about a day and a half to fix it up on mine and now it just needs fixing again... so I just bought a club and hoped nobody found out it wouldn't lock.
First off, before you do anything you will need to make sure the lock cylinder is in the off position. If this is not done, you will need to reprogram the PCM (Powertrain Control Module) after replacing the ignition switch. Next you will need to remove the radio from the dash (you will remove the cylinder through the radio opening). Next, you will need to remove the beauty ring around the keyhole on the dash. Behind this there are 2 bolts. Once you remove the 2 bolts, you will be able to pull it through the backside of the dash and disconnect the 2 plugs and the anti-theft sensor. IF for some reason you are not able to remove the switch in the off position (if its stuck in the on position like mine was), you will need to reprogram the PCM after replacing the ignition switch or it won't start. You can get the steps to do that for your vehicle from your local GM dealer.
If you are just replacing the switch alone you have to disable the SRS airbags so the don't employ on accident. Then you have to remove the knee and column plastics. Once that is done trace the wires from the key lock cylinder to the electronic ignition switch. Unplug and remove bad switch and reverse order for assembly. If you are replacing the key lock cylinder you have to do the first 2 steps above then drill out the shear head bolts and rmove them with a screw extracter, install new switch with new shear head bolt until the head breaks off and then reverse order for assembly. Hope this helps.
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