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Troubleshooting Pre-Collision Warning After Installing Brake Controller on 2018 Toyota Highlander  


After installing the Tekonsha P3 on my 2018 Toyota Highlander, I receive a Pre-Collision System Malfunction when using the slide switch.


Expert Reply:

The issue is the wire you ran the red wire of the P3 part # 90195 to. We've heard from Tekonsha that a 1 amp diode needs to install on this circuit to prevent the controller from backfeeding onto the vehicle wiring. Or you can use the part # RM-690 from us. The "IN" side would point towards the vehicle.

I attached an install video of a brake controller to this page on a 2018 Highlander for you to check out as well.

expert reply by:
Jameson C

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