I hit the lock button on my car today and wanted to make sure that they were all working as the car has been torn apart for the last 6 months. I finally finished the car last night. Anyway after hitting the lock I tried all of the doors, all were locked except for the right rear door. When you pull up on the handle you hear the lock motor inside the door and the door opens. The other doors stay locked. I tried switching the child safety lock but that didn't fix it. Any suggestions?