I have a 2006 Pontiac Torrent and just recently started having problems with the power locks. When the car is in Park and I put it in Drive, the doors lock like they are supposed to. But, when I go from Drive to Park, the doors don't unlock. The back doors would unlock, but not the front doors, but now, neither the front or back will unlock when going from Drive to Park. Any suggestions on what to do to fix this problem? Thanks.