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#1
05-04-2019, 09:32 AM
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Towbar wiring
I have now mounted trailer towing hitch on my X5 E53 2004 -3.0L diesel. Is it okay to connect it with "vampire" clamps for tail lights and brake lights? I reckon there will be an error message while driving with a trailer but I can live with it because I only use the trailer a few times a year 
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#2
05-04-2019, 10:06 AM
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No, the system uses pulsed voltage for the regular tail lights which doesn’t work well for added trailer lamps. The best solution is to add the factory trailer harness. You can also find more universal https://www.etrailer.com/t1-2003_BMW_X5.htm solutions
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A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams  2003 X5 4.6is Estoril Blue 2005 Infiniti G35X 1972 Datsun 240Z 1991 Isuzu Impulse XS Sold 1972 Fiat 850 Spyder Donated 1972 Datsun 240Z Sold 1972 Datsun 510 Sold 
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#3
05-04-2019, 11:33 AM
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The previous owner of my rig did this by clipping onto the left side brake light. It works fine, but it does throw an error on the dash. I cant get my hands on OEM tow module wiring because its out of production, and this works completely fine, so this is what I'm sticking with.
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2003 3.0 5MT Topasblau Purchased in 2016 and sold in 2024 2012 35d Platingrau
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#5
05-04-2019, 08:54 PM
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There's plenty of OEM trailer modules on eBay...
https://www.ebay.com/itm/BMW-5er-Tou...wAAOSwgVJb7s4M
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) 
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#6
05-05-2019, 06:39 AM
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Have seen these on ebay, but have heard that coding is required, how do they work? sorry for stupid questions but where do you connect to the cables to the trailer outlet? There do not appear to be any outputs from the module
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#7
05-05-2019, 10:06 AM
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Plenty of modules... not many wiring harnesses. The OEM module was still available new the last time I looked, a couple of years ago. But the wiring is OOP.
Also, yes, everything works. I have been towing my camper trailer for a year and a half with my X.
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2003 3.0 5MT Topasblau Purchased in 2016 and sold in 2024 2012 35d Platingrau
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#8
05-05-2019, 04:41 PM
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Quote:
You will need to either buy or make a loom to run from X393 to the trailer connector. Trailer module (A6) location: - https://www.newtis.info/tisv2/a/en/e...0d-sav/UbOhty7 Wiring diagram: - https://www.newtis.info/tisv2/a/en/e...module/aqJPW9Y X393: - https://www.newtis.info/tisv2/a/en/e...3-x393/WPttOaj I've also attached the OEM hitch installation PDF, for your reference. HTH...  *edit* - module coding not required. And if you cannot find a mating connector for X393, then add the module and use wire-taps on the loom at X393 to wire your own trailer connector.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01)
Last edited by wpoll; 05-05-2019 at 08:29 PM.
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