I have a 1990 325i. I was wondering why my ICV is always buzzing even when the car is off. I am having to unplug it when I am not drive it. Any ideas?
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Break out the multimeter and find the wire that is still getting 12v when the car is off -
The white 5 pin relay most likely has a short. It's located next to two orange relays on the driver side strut tower, under a little black box (if still present).
To test, just pull it out. If the ICV stops buzzing then that's it.Comment
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If it's that relay mentioned above. Pelican has them. Don't use a brand you find at Autozone(or insert any auto parts store). I found out the hard way about relays.Comment
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If the main relay was working properly and you pull it out then the ICV would turn off anyway. I do not think that my main relay is bad.Comment
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