You don't change parts and hope that it solves the problem. You need to perform test first.
Is vehicle equipped with Keyless entry system?
Does using the key to lock works?
Does the locking works with passenger door?
If no the the above, the body control unit is the component likely to be at fault.
Please consider a to help us answer more questions.
Monday, November 12th, 2012 AT 1:03 PM