I have an 1995 E34 518i SE and it has been draining the battery overnight for the last 2 nights. I had the RAC out yesterday and they found that there was a 1.5 amp current draw causing this. I also noticed yetserday that there appears to be a buzzing noise coming from behind the centre air vents. When fuse 20 is removed both the current draw and the buzzing noise stop. If the fuse is re-inserted the buzzing noise remains stopped. I have removed the relays in the fuse box one by one to see if one of them is causing the problem, but none stop the noise. Could someone please advise if there are any other relays that may be at fault and if so where they are located or can someone suggest what to check next.
Thanks in advance, Hamid