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Situation: With either key on unlocking, passenger mirror moves back and forth. I can hear, I think, a relay clicking near the mirror. With key #1, it does the auto adjust to the seat at a setting for a long legged midget. I have the Easy Entry in the DIC off.
No codes in DIC. I try to enter my settings for mirror and seat in either key 1 or 2. But like a cat, it just randomly ignores me.
Since I'm the only driver, I'd like to disable that whole system of auto adjust. Either that or use my Glock .40 to kill that f**king Gremlin that's changing the setting everyday.
I honestly believe that GM hired Lucas Electric to design and build all the electrical and electronic components for the C5. Nothing else could explain all the screwed up electrical and electronic problems in these cars.....
I do miss the more basic, raw cars that didn't try to pamper you. Get in, adjust seat, go.
The other two are stating they can't talk to the IPC. Might want to look inside of the door accordian tubes for a possible shorting serial buss wire there. Bill Curlee has great pictures of this issue. Not sure this is your cause but check it out just in case.