Heated wing mirrors - power on all the time?

[r1cho]

Hi there, Hoping someone might be able to help. I have a 2007 B6 Passat estate and one of the mirror glasses fell off the other day. As a result I removed the heated pad and unplugged the two connectors. The mirror heating hasn’t been working for quite some time on both wing mirrors so I thought I would take the opportunity to check why. Having put my multimeter across the connectors I’ve discovered that I have 7 to 8V showing at all times (on both mirrors) even with the ignition off and all switches turned off including the one in the door and the rear view dimister. Is this normal and if not do you do you have any suggestions why am I be getting power at all times. Would have expected there not to be any voltage with ignition off.Many thanks.