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Old 02-07-2013, 05:45 AM
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Fudman Fudman is offline
Officially Welcomed to the 'Fest
Location: Sudbury, MA
 
Join Date: Apr 2007
Posts: 6,298
Mein Auto: '02 530i Sport auto
I have attempted to follow this thread but honestly, I would rather replace a CCV than troubleshoot an electrical problem on an e39. Your removal of Fuse 76 appears to validate that the drain is occurring in the heater blower circuit (which includes the FSU). Have you pulled and tested your FSU yet? Even though yours was replaced a few years back, the FSU lacks a track record for reliability. Did you originally replace your FSU in 2009 with a dealer sourced part? If yes and the FSU is the cause of the problem, this would suggest that even dealer sourced FSUs have an expiration date. Just one more thing to keep an eye on...
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