My brother has an 05 Malibu, and his door locks are not working correctly. When you hit the lock button on the inside (either driver or passenger door) the passenger side doors will lock, but the locks on the driver side don't move at all. When you hit the unlock, sometimes the passenger side door locks will unlock, but it's intermitten. I have narrowed down the switch on the passenger side door is bad and needs replaced. The locks for the driver side never lock or unlock unless using the key in the driver door, then only the driver door unlocks or locks, but the back driver side door never moves unless you manually pull up or push down on the lock. Any suggestions?????