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7-pin wiring harness for 2017 Highlander Limited?
I bought my 2017 Highlander Limited hoping to get the happy medium between daily driving and towing my 3500 lb (max with cargo) hybrid travel trailer. But the 7-pin wiring harness/brake controller has been making me regret my purchase.
Dealer couldn't install 7-pin (said no OEM available) and sent me to The Hitch Man across the street. They installed it in late April, and it was giving them fits, but they finally got it done.
Took the trailer out over Memorial Day, tried to adjust it while the engine was running, got a pre-collision sensor (PCS) error message on the display screen that told me to take it to the dealer. Turned the Highlander off and on again, error code gone.
Got back from camping & took it back to Hitch Man who promised to make it right (no more money required - I appreciate their integrity). After another 4 hours, the error code was constantly on along with another safety related code. They sent me to the dealer with instructions not to give background so that the dealer could look at it with fresh eyes. Dealer pinpointed the brake controller connection as the issue, Hitch Man took it out of the system and the error codes went away.
I haven't had time to get it back in yet, but I have an appointment with Hitch Man in a week to get the brake controller moved. This time they plan to tap into the 3rd brake light.
Has anyone done this successfully? Do you have tips/tricks that I could show Hitch Man? I think it is outrageous that they didn't design this vehicle with a 7-pin wiring plug and play setup to begin with, since it is rated for 5000 pounds. How are you supposed to safely tow that much weight without a brake controller anyway?