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Originally Posted by wymi
This is just a guess, but it sounds like an ignition switch problem to me. I think the power for all the items you mentioned that didn't work come from the ignition circuit.
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You are correct in your guessing. Took it to my local auto shop today. They determined that it is the GM pass lock cylinder that was failing. They said that it would continue to work intermittently for a while but, eventually, would fail completely and the anti-theft would kick in and prevent the car from even starting at all. The manager says that he has a 2002 Pontiac Grand Prix and it had similar problems and that this problem affects a large number of GM cars. He expects that GM will have to issue a recall due to the number of these failures. The new lock cylinder cost me $169, plus $75 labor and $20 for the code to enable the new lock to use my old keys. I wonder what the dealer charge would have been?
By the way, I had them replace the serpentine belt today as well and like my son's '99 Grand Prix, in order to remove/replace the belt, one of the motor mounts has to be removed (Mine is the 6 cylinder version).