emilystar2
GLS power windows not working after battery change
Summary of the thread
After replacing the battery in a 2020 Mercedes GLS diesel, the power windows stopped functioning, with an error indicating unsuccessful window regulator initialization. Initial checks showed no issues with the fuses. Suggestions included performing a window motor reset procedure and inspecting the wiring harness. Ultimately, the solution required professional reprogramming of the window regulator, resolving the issue.
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4 comment(s)
emilystar2 (community.author)
Window motor reset procedure? I've never heard of that. Is there a special sequence? And where in the wiring harness should I be looking?
antonlang8
The reset usually involves holding the window switch up for a few seconds after it's fully closed, and down for a few after fully open. Google it, you'll find the exact process. As for the harness, it's in the rubber boot between the door and the body. If that doesn't work, you're probably better off letting the pros handle it. I ended up at the workshop.
emilystar2 (community.author)
Thanks, I appreciate the info. Tried the window reset procedure, no luck. Didn't see anything obvious with the wiring. Took it to the shop. Turns out the regulator needed to be reprogrammed after the battery change. Cost me 290€, but at least the windows work now.
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MERCEDES
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GLS
antonlang8
Sounds familiar. I had a similar issue with my GLS after some electronics work. Have you tried the window motor reset procedure? Sometimes they forget their limits. What about checking the wiring harness where it passes from the body to the door? It's a long shot though.