Activating Brake Controller/Trailer Connector Feed on 2016 Mercedes-Benz GLE 350D Coupe

Question:

Hi, I have 2016 MB GLE 350D Coupe, and it come with OE Trailer Hitch but no power, how i can turn on the power. Thanks

asked by: Elan

Expert Reply:

I'm assuming that you've already installed the Tekonsha P3 # 90195 and it's not powering up, is that correct? You'll want to first ensure that you're using the correct brake controller wiring adapter, part # 3066-P which is compatible with Tekonsha and Draw-Tite brake controllers.

If you're using the correct brake controller wiring harness, the most likely reason the controller isn't powering up is a missing fuse. I've looked at the owner's manual, which states that in the fuse box under the trunk floor, fuses 433-437 are for the Trailer Recognition Unit, but there's no further explanation as to what actual circuits the fuses actually protect. Also, in the fuse panel located in the driver's side footwell has a fuse in location 308 that is described as Electric Brake Control Connector which is the most likely suspect. Make sure the fuse is in place and not blown.

I've linked to a video that will walk you through how the Tekonsha # 90195 P3 Brake Controller works.

expert reply by: Mike L