2020 Sierra 2500 HD (base model) gas engine 4wd.
All 4 windows roll down on their own. Happens somewhat randomly after stop and engine off - when engine turned off, when walking away from vehicle before or after locks activated. Pulled the window fuse F14 Instrument Panel Fuse Block Right; the driver's side still activates from driver's side door panel; passenger and back seat windows activate from local switches on their doors but not from driver's side group of switches. Power mirrors don't activate with fuse removed either (same fuse for both circuits). Problem not solved.
How can they even activate with fuse removed but they are all still opening and can control from each door? When they open on their own, I can shut them from the switch in each door, but they don't stay closed.
Seems to be activated somehow with key fob; something bumping the key fob in my pocket or just handling - removed key fob and took it far enough away and now the windows stay closed. Replaced key fob batty just in case, no change.
Sounds like some kind of wiring short or maybe electronics. Dealer will first replace electronic control module without checking anything else and I anticipate problem will still exist since their troubleshooting skills are limited to "do whatever the computer says". In any case, keyfob seems to be activating the circuitry.
Surely I'm not the only one with this issue, but I can't find anything related on the site. What do yall think?
JohnRoy
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