Recommended Diode for 2017 Toyota Highlander To Prevent Lane Departure and PreCollision Dash Warning

Updated 03/18/2019 | Published 03/16/2019

Question:

Installed primus IQ brake controller and when the trailer is connected i get a pre collision system and lane depature alert malfunction on dash. When i disconnect the charging wire i can be hooked to trailer with no malfunctions. When there is no trailer attached and i squeez the boost i get the same malfunctions of pre collision system and lane depature alert. I still have the charging wire disconnected. I bought the single diode from you guys will this fix this problem if so where would i install this part. The brake controller is installed on a 2017 toyota highlander. Any help would be greatly appreciated

asked by: Steven J

Helpful Expert Reply:

On your 2017 Toyota Highlander, you are experiencing feedback from your brake controller onto that stop light switch which is causing the error messages you mentioned. You will want to install a diode on the red wire leading to the brake controller to prevent this feedback and subsequent error message. There should be an arrow or label of in and out to ensure you install the diode in the correct manner as you want the power on that red wire to flow toward the brake controller not away from it.

The smallest single diode we have is the Roadmaster Single Park Light Diode # RM-690 which should work for this application.

expert reply by: Jason S