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Function of Under Dash Converter in Trailer Wiring Hanress # 118449 for a 2008 Toyota Highlander  


Part # 118449 has two components what does the component that goes under the dash do?


Expert Reply:

On the 2008 Toyota Highlander, the component that connects under the dash is the converter box. This is used to convert the 3 wire vehicle signals into 2 wire signals used by trailers by combining the directional and brake light signals into a single circuit to match the wiring set-up of the trailer.

The signals come into the converter which converts then for trailer use and then it sends the converted signals back through the system to the rear of the vehicle where the second harness is connected. I have included links to the installation details and a video showing installation on a 2008 Toyota Highlander.

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