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2009 chevy
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6,513 Posts
It's probably a program change to the module that controls the windows.
There would be a number of modules involved (each door/window has a control module that talks to the body control module (BCM).
The programing is probably in the BCM.
 

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2004 gmc
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26,436 Posts
It is a BCM software function, and we can't touch that programming. You would have to design a hardware timer circuit to fiddle with the window switch signal itself. Easy to design, harder to install since you have to go inside the door modules.
 
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