2010 GMC Terrain Ignition Lock Cylinder

You can disconnect the battery negative cable, remove the steering column shroud, insert the key into the ignition lock cylinder, turn the key to the RUN position, depress the retainer through the lock housing access hole, and remove the ignition lock cylinder.

You can code the lock cylinder, turn the key to the RUN position, insert the ignition lock cylinder into the ignition and start switch housing, turn the key to the LOCK position, remove the key from the ignition lock cylinder, install the steering column shroud and connect the battery negative cable.