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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-21-2005, 11:37 AM   #1
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Join Date: Apr 2004
Location: Gainesville, FL
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My Ride: 1999 328i Sp/Pr 5sp
Headlight Power Chain Possible?

Hey guys, a few days ago my right HID headlight (Proxenon 9000 series) went out and when I went to my shop to get it fixed, they said the power to the right headlight was dead and there was a short causing it. The guy at teh BMW dealership who didnt seem to know much suggested daisy chaining the power from the one still working headlight over to the dead one. The shop refused to do this so they wouldnt be liable. Anyone have any comments on this idea? Am I going to short out the ECU or anything? Any help would be much appreciated.

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Old 10-21-2005, 12:44 PM   #2
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Each light in an E46 receives its own individual power from the LCU which are all switched by transistors, so I would be concerned about overloading that branches transistor and causing more damage. Did it blow a fuse? If the failed circuit is truly shorted out you'd think it would, and take the other headlight with it. Plus in the end you'll have the headlight-out lights on all the time due to the unbalanced load.

You'd be better off getting that wire and/or circuit fixed properly. It is the smarter and safer way to do it. And good tech should be able to figure that out.

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Old 10-24-2005, 10:18 PM   #3
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Did you do anything recently that would pinch a wire?

Try tracking the problem yourself, with a volt meter is there continuity between the wire and a grounded source.

If all else fails you could use a relay and the other headlight as the trigger.
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