Pre Collision Warning Error After Brake Controller Install on a 2017 Toyota Highlander

Question:

I am seeing the pre collision error with a Reliance brake controller installed on a 2017 Highlander. You posted solution here https://www.etrailer.com/question-277968.html For a different controller. Is the solution the same for a reliance controller? If so which wire do I attach the diode to on the controller? Red wire?

asked by: Jeremy

Expert Reply:

The Collision System Malfunction error message that you are experiencing on your 2017 Toyota Highlander after installing the Hopkins Reliance Trailer Brake Controller is a result of power backfeeding on the stop light switch wire into the collision system. In order to eliminate this you are going to need to install a 1 amp diode on the red wire between the brake controller and vehicle's wiring harness. This will then prevent power from backfeeding and allow you to use the Reliance on your vehicle without the error message.

Unfortunately, we do not carry the 1 amp diode so you need to source this elsewhere.

expert reply by: Conner L