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E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio - General Forum
The E9X is the latest evolution of the BMW 3 series including the highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! Post questions about "upgrading" from your current E46 here or jump over to E90Fanatics.com!

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Old 02-11-2013, 04:53 PM   #1
tritone88
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Join Date: Oct 2006
Location: Santa Rosa, Ca
Posts: 13
My Ride: 2001 325i
Both backup and one tail light are out. Voltage to socket until you put a bulb in???

This is really weird or maybe not to those who know the answer. Have a 2006 E90 sedan. Both backup lights and the right tail light in the trunk are out. First swapped out all bulbs, tail light still out. Then swapped the bulb carrier left to right and still no light. Tested voltage across socket with bulb out and it shows 12 volts. Then put brand new bulb back in and voltage disappears!!!!!!????? Remove bulb and 12 volts reappears. I have never seen this before. Any suggestions? The FRM module?

I can't believe it is a trunk wiring break as I've read since there is in fact voltage to the sockets until a good bulb is put in.

Thanks

Last edited by tritone88; 02-11-2013 at 04:55 PM.
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Old 02-11-2013, 05:22 PM   #2
atinybug
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Join Date: Apr 2004
Location: Atlanta
Posts: 361
My Ride: e92 335i
Maybe you're using the wrong type of bulb? I remember on my old e46 I didn't know any better and put a bulb with the metal part being copper or something, and for some reason it screwed up the wiring back there and even affected the headlights. It can only use the ones with the silver colored metal parts.
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Old 02-12-2013, 09:37 AM   #3
tritone88
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Join Date: Oct 2006
Location: Santa Rosa, Ca
Posts: 13
My Ride: 2001 325i
Thanks for your reply. I'm using the standard BMW OEM bulbs.
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