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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 01-16-2006, 09:30 PM   #1
Obioban
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HELP! Need a wire I can tap (for relay) only when xenon highs are on

Anyone know where one is in the car?
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Old 01-16-2006, 09:37 PM   #2
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Are you trying to wire your garage door opener to your high beams. Do you have xenon high beams i don't think they make them cause it takes a few seconds for it to reach the right brightness.
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Old 01-16-2006, 09:47 PM   #3
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no, I want to make my halogen highs (inner bulbs) come on with my xenon highs (outer bulbs). I'm going to wire a relay but I need something to trigger it off of.
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Old 01-17-2006, 10:11 AM   #4
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Originally Posted by Obioban
Anyone know where one is in the car?
Check this thread:
http://forum.e46fanatics.com/showthr...ghlight=garage

Post # 19 might tell you which wire to use...
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Old 01-17-2006, 10:25 AM   #5
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nope, that just tells me which powers the headlights, which I already knew.
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Old 01-17-2006, 11:54 AM   #6
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Sounds like you need to tap to the bi-xenon shuuter trigger. My xenons were a retrofit so I can't tell you the wire colour, but you are looking for the center pin of the smaller three pin connector going into the OEM ballast (this controls the shutter mechanism. It is positive trigger and should work fine with an extra relay load, but be sure to reverse-diode the relay to prevent spikes.

BTW this is the way I wired my high beam setup and it works great. Only problem is I believe you will loose flash-to-pass unless you get a bit creative with diodes.

Mark
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Old 01-18-2006, 10:20 PM   #7
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http://www.bimmerfest.com/forums/showthread.php?t=46813

http://forum.e46fanatics.com/showthread.php?t=296547
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Old 01-18-2006, 10:22 PM   #8
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Originally Posted by Canuck328i
Sounds like you need to tap to the bi-xenon shuuter trigger. My xenons were a retrofit so I can't tell you the wire colour, but you are looking for the center pin of the smaller three pin connector going into the OEM ballast (this controls the shutter mechanism. It is positive trigger and should work fine with an extra relay load, but be sure to reverse-diode the relay to prevent spikes.

BTW this is the way I wired my high beam setup and it works great. Only problem is I believe you will loose flash-to-pass unless you get a bit creative with diodes.

Mark
If you just tap the high beam wires you don't lose the flash to pass. Mine is wired to that the shutters are only active if the xenons are powered. So if the headlights are DRL only the flash to pass works as it normally would.
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