Brake lights not working on trailer

[daus318]

I had my hitch installed by BMW a few weeks back on my 35d and it tows great but the problem is that my trailer brake lights don't work. Both turn signals work and the parking lights work. Also, all trailer lights strobe (like a warning) when I plug in the trailer. Any ideas?

[durnie]

Originally Posted by daus318

I had my hitch installed by BMW a few weeks back on my 35d and it tows great but the problem is that my trailer brake lights don't work. Both turn signals work and the parking lights work. Also, all trailer lights strobe (like a warning) when I plug in the trailer. Any ideas?

If your trailer is running led lights you will have problems with warning lights as the system thinks there is a fault, I think because it draws less power.

[Denalio]

Are you using the correct adapter plug?

[daus318]

Originally Posted by Denalio

Are you using the correct adapter plug?

Not sure, it's the plug the BMW provided to me.

[TetherEd]

Daus,

Did you get this working / talk to the dealer? I am having the same problem with my 35d.

Ed

[daus318]

Not yet, my dealer is in contact with BMWNA to figure out the issue. The only thing I know right now is that it's a computer problem. They said it's a "faulty module"

[TetherEd]

Thanks for the reply on this. I am really ticked off about having spent 65K on a car that has a jacked hitch install kit with electronics that don't work. Do let me know if they find the solution

Thanks!

Ed

[watrob]

You cannot use trailers that have led lights on them, that is all the problem is!

[apw2607]

Yea, LEDS are a no go for sure, unless you add a resistor. Additionally the load (or resistance) of the trailer lights needs to match the expected load. BMW should publish this in the owners manual.

[killcrap]

re-code vehicle