To replace the ignition lock cylinder, first disconnect the cable from the negative terminal of the battery and remove the steering column covers. Insert the key and turn it to the ACC position, then use a small round tool to depress the release pin and pull the ignition lock cylinder out. For the ignition switch on 2009 and earlier models, disconnect the cable from the negative terminal of the battery, remove the steering column covers, disconnect the electrical connection, release the two locking tabs, and pull the switch away from the steering column, with installation being the reverse of removal. For 2010 and later models, remove the center console trim panel, take out the ignition switch housing bolts, pull the housing out of the dash, disconnect the electrical connector, depress the tabs on the sides of the switch to remove it from the housing, and reinstall in reverse order. If changing keys or the tumbler, reprogramming is necessary for the vehicle to start. Ensure the switch snaps into place during installation. The push button start system operates using electronic modules instead of a lock cylinder and key, with the Remote Function Actuator utilizing battery voltage to mimic the function of a conventional key. The start/stop button sends a momentary signal to the module, which checks various inputs before authorizing the car to start using the wireless Intelligent Access key fob signal. Testing and repairs for this system are typically beyond the capabilities of a home garage, so professional assistance is recommended.