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The electric windows keep self-opening on my BMW - what's the cause?
One morning this week I came out the house to find all the windows on my 68 reg BMW 430d Gran Coupe were down. All the doors were locked and nothing was damaged or missing. I know you can open the windows by pressing and holding the key, but that also unlocks the doors which wasn’t the case. I’m worried this may have been a failed theft attempt.
My local BMW dealer had no comment other than if I brought it in they would have a look (for £100!) Can you shed any light? I’ve ordered a Faraday box in the meantime.
My local BMW dealer had no comment other than if I brought it in they would have a look (for £100!) Can you shed any light? I’ve ordered a Faraday box in the meantime.
Asked on 6 October 2023 by Simon Harniess
Answered by
Craig Cheetham
The most likely problem here is that there's some damage to wiring between the door and the body control module (BCM) or a fault with the BCM itself. The front BCM is the most likely culprit.
It's a rare but known problem that can occur on all derivates on 3 and 4-Series, usually where wiring has chafed in the door shut area and made a bad connection, but sometimes where the BCM has sustained water damage. Being a known issue on 2013-onward 3 and 4-Series models, and with your car now being out-of-warranty, you should be able to get it investigated much more cheaply by an independent BMW specialist.
It's a rare but known problem that can occur on all derivates on 3 and 4-Series, usually where wiring has chafed in the door shut area and made a bad connection, but sometimes where the BCM has sustained water damage. Being a known issue on 2013-onward 3 and 4-Series models, and with your car now being out-of-warranty, you should be able to get it investigated much more cheaply by an independent BMW specialist.
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