Solution for Trailer Brake Controller Causing ABS Error Message on 2015 Toyota 4Runner

Question:

I have a 2015 Toyota 4-Runner and was using the Toyota Factory Connector and the Drawtite Pigtail Brake Controller Wiring Harness. I have an ABS light coming on the Dash after getting off the phone with Drawtite they tell me I need Pigtail Wiring Harness with Diode Part Number 7865 to eliminate this error message to the ABS. I would like to have a clean wiring harness, so that is why the question on the 3041P.

asked by: Jon B

Helpful Expert Reply:

The issue you described when using a brake controller isn't too uncommon on certain late model Toyota vehicles like your 2015 4Runner. These particular vehicles are more sensitive to the controller's red wire backfeeding to the stop light switch, which is what triggers the ABS error message.

The only way to prevent this is to use the a diode with the harness and the Pigtail Harness # 7865 that you mentioned offers a perfect solution as it features a diode on the red wire. The Plug-In Harness # 3041-P that you also referenced does not feature this diode so you would run into the same issue. This particular harness also requires that the mating factory plug is present behind the dash of your 4Runner.

expert reply by: Chris R