Your problem probably is the multifunction switch. Try looking on eBay to save a bunch of money. There's a new one on eBay right now for $55 + shipping. It's pretty easy to replace as the steering column has a few screws and the switch itself a couple more. Take off a couple of wire connections and a small part from the old one and put them on the new part and put everything back together.
eBay Motors: Multifunction combo switch 05 PT Cruiser (item 300137287333 end time Aug-07-07 19:56:28 PDT)