I'm thinking its the cylinder not the switch. I can always have the new cylinder keyed to my existing keys. problem I'm having now is removing the cynlinder. there is a collar around the column with weird bolt holding this collar to the cylinder. It's not a screw head but looks like a small hex head tht needs a very small wall to fit in the channel of the bolt. I'll check with Courtesy see if they'll tell me what I need. If someone out there has a manual with the instructions for replacing the cylinder and associated electrical connections that would be a great help