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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 05-29-2011, 12:37 PM   #1
mjhockey155
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Trailer Harness for LED Lights

I have a 04 330ci with the LED tail lights. I need to install a trailer harness, however, I cant seem to find any information on which wires control the brake lights and turn signals that lead into the circuit board. Below is the link of the harness that I plan on using.

http://www.etrailer.com/p-119176KIT.html

Does any one have a fsm that could possible look it up?
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Old 05-29-2011, 03:00 PM   #2
330ciandr6
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i'd simply use a multimeter and just test em and figure it out.
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Old 05-30-2011, 11:01 AM   #3
mjhockey155
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There has to be someone out there that has LED tail lights with a trailer.
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Old 05-30-2011, 03:38 PM   #4
E-XLVI
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Your post motivated me to post my working diagram.
http://forum.e46fanatics.com/showthr...1#post13224061

PIN7 -taillight ground
PIN5 -taillight on
PIN3 & PIN6 -braking & indicator

Seems PIN3 & PIN6 maybe the interesting connection. Here's some additional info:
http://blog.bavauto.com/bmw-e46/bmw-...-and-converter

I recommend using the kit's circuit tester to review all connections. Then, please post the working connections and wires in the Lighting or DIY forum. Thanks


** assumptions: OEM LED taillights; resistors, etc are on the circuit board. Aftermarket, you'll have to move infront of the external resistor box.

Last edited by E-XLVI; 05-30-2011 at 03:46 PM. Reason: assumptions
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