Hello friend, I tell you that the removal of the steering wheel in a vehicle with Air Bag is a procedure that requires specialized knowledge and most times special tools because there is a serious danger of explosion and personal damage can be serious. Admeas. If you manage to take out the airbag without problems, do you do the central bolt of the steering wheel because the inside of the direction column has bearings and the axis has a sliding joint and at least 2 cardan joints that can be damaged. Instead you can get an extractor type crow and with two M8 screws you can extract it without finding anything. The key cylinder you have to take it out with the key in ACC position (it does not come out in any other position) the iterruptor, what you call switch is subject by 2 Torx screws very small. And you change it. Before performing all these procedures, be sure to disconnect the battery. keep me informed about how you are doing