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      01-27-2020, 05:37 PM   #19
456bhp for breakfast
russelldav's Avatar

Drives: 2019 X5 50i
Join Date: Oct 2013
Location: Vancouver, Canada

iTrader: (0)

For those interested I think I got hold of the trailer brake connector wiring diagram for the G05, pre-installed with the factory hitch. This is for a US/Canadian spec. vehicle. I have no idea if it changes in Europe/Asia. I plan to create my own wiring adapter so I can plug and play a brake controller for the couple of times a year when I tow a trailer.

The harness is hidden under the steering wheel, underneath the dashboard.

PIN 1: BLACK / Brake Switch
PIN 2: RED / +12V Power Supply
PIN 3: BLUE / Trailer Brake
PIN 4: BROWN / Ground

See image attached kindly supplied by my service dept.

I know a few people have already tried this on the X3 so I am interested in your feedback e.g. sptucker
Attached Images