when I unlock the doors w/the master switch the drivers side back door does not unlock
Not sure Harv. Sounds like a signal is not getting to the rear door or there is something wrong with an electrical connection. Sorry couldn't be of more help.
when you turn your key from the out side of your door. hold it for a couple of secs. and all the doors should unlock. if you just twist it real fast onlyt he driver door should open. if it's just that door then check electrical connection when pressing lock and unlock.
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