Disconnect the battery, then there is an access panel on the bottom of the wheel. Take that off and there is a little plastic clip on the cover panel. Take that off. Then inside the wheel, there is a yellow cable. Unplug it and stick the red clip from the cover panel into it. You have just disabled the airbag. Now, go to each side of the wheel and take the cover panel off again. There will be a torx screw on each side. Take those out, and the air bag will fall out. Then the steering wheel is a 19mm. You're done.