Why do my Golf's windows open when parked in the rain?

I have a 2009 Golf 1.4 TSI SE which is still under warranty. Last night we had very high winds and heavy rain and, when I looked this morning, all four windows of my car were open at the same level and the car is soaked internally. Where I live is not close to any passing traffic and I am meticulous about checking that all the doors and windows are shut. I keep my car keys in a place where no-one can touch them. My local garage has said they have never heard of such a thing happening to a Volkswagen car. Have you heard of such an incidence as this?

Asked on 31 March 2012 by JM, Storth, Cumbria

Answered by Honest John
Very common. It's because the electronic 'brain' is inside the driver's door, which is a wet place, and the ECU is subject to moisture ingress. The other reason is accidentally pressing the buttons again, explained in the handbook.
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