Passlock system problem

What is your question?

My passlock system on my 96 Pontiac Grand Am is not working. I took it to the dealership to find out what the problem is. They told me the ignition lock with passlock needs to be replaced andestimated it to cost $368 to fix. I know there is a sensor on the ignition lock that controls the Passlock system. Can I just replace the sensor or is it all part of the ignition lock? How much should this really cost to repair? Thanks in advance.