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Old 09-12-2011, 05:15 PM
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JCL JCL is offline
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Join Date: Mar 2005
Location: Vancouver, Canada
Posts: 11,853
JCL will become famous soon enoughJCL will become famous soon enough
If you buy the BMW controller (which is rebranded, they don't make them) it plugs right in. Early hitch instructions for the E70 say that BMW doesn't have a trailer brake controller. That was true at the time. When the controller came out it was advertised as being suitable back to start of production in 2007.

Install instructions attached below, with part numbers.

The alternative is to buy a Tekonsha Prodigy, P3, or whichever model you choose.

Instructions courtesy X5Meister, from this classic thead:

Attached Images
File Type: pdf E70 Trailer Brake Kit.pdf (634.9 KB, 830 views)
2007 X3 3.0si, 6 MT, Premium, White

2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver

2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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