Silly question but have you changed the fuse?
If not fuse, it may be the seat switch control panel. Here's one on Rbay for less than $30

http://m.ebay.com/itm/06-Chrysler-Crossfire-Heated-Seats-Control-Button-Switch-Panel-A1938200610-/162322079884?fits=Make%3AChrysler%7CModel%3ACrossf ire&hash=item25cb26608c%3Ag%3AvdcAAOSwcUBYUrBA&_tr kparms=pageci%253A2e51c420-c93c-11e6-bb0b-74dbd1800fdd%257Cparentrq%253A2ce7b35d1590a605b71a 14b5ffdacb70%257Ciid%253A1