Troubleshooting Brake Controller of 2018 GMC Adacia Not Working with Brake Pedal
Updated 09/03/2020 | Published 04/20/2018
Question:
So guys at my shop installed break controller. Everything works including emergency 12 volt breaks. But the actual brake pedal sends no signal to trailer breaks
asked by: Andrew H
Expert Reply:
So the red wire of your brake controller needs to be connected to a circuit of your 2018 GMC Acadia that sees voltage only when the brakes are applied. If you used a custom install harness on your Acadia like the # 3026-P to install the controller then most likely you have a blown third brake light fuse since that's connected to the stoplight circuit for the brake controller.
If the controller was hardwired to a stoplight circuit you most likely need to check the condition of the connection the controller is making to the third brake light circuit as it may not be making a solid connection.
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Steve
7/20/2020
We have a 2019 Acadia with the trailing package. The four blunt cut wires were found under the dash with no problem. Question, there is no power from the brake signal wire when the brake pedal is applied? Is there something that needs to be activated on the car? I have noticed several others ask the same question. Your input would be appreciated!