Hi
Hope I can help with this.
It sounds like the door lock may have failed. When the lock " dead locks " it can either not lock, or not unlock.
My suggestions is to take it to your local garage, if you have one, and ask them to remove the door panel from the rear passenger door and try see if the door lock can be manually locked by hand. If it can, then the door lock may still be able to be saved. If not, the lock may need replacing.
Let me know if you need any more help or info!
Thursday, January 7th, 2010 AT 4:00 AM