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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 10-06-2011, 09:18 AM   #1
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Join Date: Oct 2011
Location: Louisville, KY
Posts: 1
My Ride: 2004 330xi
Parasitic Drain from Fuse 62 (Heater, A/C, Water Valve) Help!

I've had a parasitic drain on my battery for a while now, causing it to die overnight every few weeks. I recently tracked down the source of the drain to fuse 62 using a multimeter (when I pull the fuse, the mAs drop from 600 to an acceptable 100 on the multimeter).

According to the fuse diagram, 62 is related to the heater, A/C, and Water Valve, A/C. From looking at the electrical wiring diagrams in the Bentley Book, it is fuse 28 that actually controls these systems and I can't find fuse 62 in any diagrams.

I'd like to hook up the multimeter to that specific fuse and start checking the individual parts that are in the circuit, but I can't figure out what parts exactly are in the fuse 62 circuit.

Possibly the FSR? I've heard that it is fuse 50, but i'm not an expert.

Any help is greatly appreciated.
rezatdorsias is offline   Reply With Quote
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Old 10-06-2011, 05:45 PM   #2
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Join Date: Sep 2011
Location: CO
Posts: 244
My Ride: 330Xi
Just unplug the final stage resistor, water valve and IHKA (one at a time) while monitoring the draw (and elec fan if it has one).
Max acceptable draw is 40 milliamps after 16 minutes.
fastjasonbmw is offline   Reply With Quote
Old 10-11-2011, 11:31 AM   #3
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Join Date: Nov 2008
Location: West Haven, CT, USA
Posts: 2,043
My Ride: '01 330xi - '09 IS-F
Not completely unrelated-
In the climate control behind the little grill there is a vane that spins. I believe it's to draw cabin air in to sample the temp. It runs for several minutes after the key is removed (I don't know if it's supposed to do that). Not enough of a drain to worry about.

2001 BMW 330xi
2009 Lexus IS-F
Rickna is offline   Reply With Quote

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