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Old 10-12-2013, 07:44 AM   #1
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when I lock, or unlock the doors, the headlights go up & down, and the passenger side buzzes for several second??https://www.gmforum.com/gm/images/smilies/confused.gif
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Old 10-12-2013, 10:47 AM   #2
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the only things i can think of are something on the door switch is causing interference with the headlight motors, through the park lamp circuit which powers the interior button lights as well as a signal to the headlight opener control module. or there are wires chafed together at one of the fuse boxes.
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Old 10-12-2013, 07:15 PM   #3
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Or back feed through a bad ground?
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Old 10-12-2013, 09:46 PM   #4
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have you checked body control module? on some cars it have certain control authority over those things
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Old 10-13-2013, 10:38 AM   #5
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the diagrams dont show any connection to the bcm for the lights on this car
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