Does the key turn to the on position?
Ok here is how to replace it. Feel free to contact me with any questions.
Push down on the allen wrench to release the tab on the lock cylinder inside the lock cylinder housing.
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.