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I've read a bunch of threads here, watched many YouTube vids too. And I still can't find mine.

Here is a photo of a connector that I did find, way up on the left behind the e-brake and stuffed into the firewall hole.

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But it doesn't seem right. The brake controller cable is supposed to be square, 4-pin right? This one is flat, long, and maybe 5?

I have a 2010 Sequoia with tow package (as far as I know). It's got the factory 7-way and 4-way camper connectors in the back. It's got the Tow/haul button under the dash.

This harness should be here somewhere, right?!
 

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How far back can you see the wiring for the plug that you can find? I would look to see if the wiring still remains stock or if there was previous modifications.
I could be possible that the previous owner spliced a different plug in there instead of the stock plug.
 

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FWIW On my 2020 the harness was taped back to the backside of a larger wiring shroud. Took more effort than I thought to track find it and I was at the same point you are during the exploration.
 
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