OEM installed Hitch package - Running lights not working

Asked by charlie7602 Jun 10, 2013 at 04:31 PM about the BMW X5

Question type: Maintenance & Repair

I have a 2007 X5. Dealer installed a Hitch package before driving out brand new.
Tried to tow my trailer a few days ago, tested the lights and everything worked fine.
However as soon as we hit the road the running lights went off. The stop and turning
lights work fine.

I reviewed installation info for the hitch package and found the location of 4 fuses in the
fuse box on the right side of the trunk. Those were F116, F118, F143 and F144,
checked them all and they look intact.

With a tester I checked the voltage in the connector to the trailer. As expected got
good measurement for stop/turn terminals but just a noise for the running light.
I don't know if the trailer has a short, still need to do a full inspection. But how can I
restore power in the car side? is there any other fuse or contact that I should check for
anywhere else in the car?

3 Answers
9,785

Robert answered 11 years ago

I will need to look at a electrical diagram for this issue because I belive the control unit controls those.

Mark helpful

charlie7602 answered 11 years ago

Thank you Robert, by control unit you mean the car computer? I'm guessing that if you are right I won't be able to fix it myself.

Mark helpful
9,785

Robert answered 11 years ago

Yes that module does need programming by a local BMW dealer. Like I said before still would need to see the wiring diagram for that year of vehicle to be sure. So many different versions of it.

Mark helpful

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