It sounds like the door lock remote control module is going out. Here is a wiring diagram so you can see how the system works and the location of the lock module.
When you replace it take you vin number to the dealer so they can program it for you.
Check out the diagrams (Below). Please let us know what happens.
Images (Click to enlarge)
Thursday, June 9th, 2011 AT 10:38 PM