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Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Toyota RAV4

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2019 Toyota RAV4

Shane: Hi, I'm Shane with Today you're going to be taking a look, I'm going to walk you through the installation of the Tekonsha T1 vehicle wiring harness with four pole flat trailer connector on your 2019 Toyota RAV4.There's a lot of good reasons to add wiring to your vehicle. Maybe you have a cargo carrier that's going to require lights. Maybe you just bought a… see more >     



Installed this on my 2022 RAV4, now the left rear brake light is stuck on. The harness works, I have full power to my trailer, however, the right rear brake light on my new car is stuck on. Help!

David B.


You have a crossed wire or a short somewhere in the wire harness. Using a tester like the Circuit Tester Kit # PTW2993 test all the leads at the harness and make sure the grounds are good too. I linked a guide for brake controllers to help out too. If the troubleshooting starts to shoot back I would talk to a mechanic to make sure that it was installed without damage or fault.

Franck P.


Hi! Do i really need to install the power wire to my battery? The modul will work without that? RAV4 2021XLE Thank's

Les D.


For a wiring harness with a isolation module included, the system will not work without the independent 12 volt line. This type of system is preferable as it protects the vehicle electronics from faults with the trailer wiring. If you really want to go old-school you can use the Curt # C58044 wiring harness and splice into the signal wiring.

Bill K.


The battery for the RAV4 hybrid is in the back on the right not under the hood.

Etrailer Expert

Chris R.


You are correct - thanks for pointing that out! On the Hybrid model of the RAV4 you would need to take a different path with the hot lead from the T-One harness because of its battery location.

Gary C.


Hi, do you have the wiring video for the RAV4 Hybrid? 2019

David B.


Sorry Gary I only have the 4 videos right now. No one with a RAV4 hybrid has brought it in for this specific item to be filmed.

Terry R.


Does a nice job of explaining the disassembly of the cars rear panels required to find the connection points!

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