Trailer Brake Controller Installation - 2012 Toyota Tacoma

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How to Install a Trailer Brake Controller on a 2012 Toyota Tacoma

All right, today on this 2012 Toyota Tacoma were going to install a brake controller, part number 90885 from Tekonsha. This is a Prodigy P2. To help us install this were also going to use part number 3040-P. This is a cable that will go between the brake controller and the port on the truck. Well start off with this part number. Well go ahead and look for the port underneath the dash on the left hand side by the drivers side door.

When we look for a wiring harness going vertical well see a mass of wires. Now, look for a rather thick blue wire compared to the rest of them and our port should be connected to that. Now in this particular vehicle the port was actually hidden behind the wires and you could not see it at all. You have to use your fingers to feel around for the back side of the wires to help pull the port around. We have it pulled out just enough to give you an idea of where to look for it.

Now well go ahead and pull the rest of the wires out, and well go ahead and plug in our adapter cable. The two white ends match up and well plug them together. Now well also take the white wire with the ring terminal and we need to ground that to the body so well take a self-tapping sheet metal screw and well attach that to the inside sheet metal of the vehicle. Now lets go ahead and find a place for our brake controller. You want the brake controller more or less in a straight position.

It can be tilted up and down as needed to, but not too much of a twist so because of this were going to locate ours on the left hand side. Well make sure our brackets straight, well hold the bracket up a little bit lower than we would and make a couple marks on the dash. Well go ahead and attach it to the plastic using the sheet metal screws provided. With our bracket in place we can go ahead and attach the adapter cord to our brake controller, and then well attach the brake controller to our bracket. Therell be two screws that attach it from the side, and then well take a few zip ties and zip tie the excess cable behind the dash.

When we plug in our trailer youll see that our brake controller will display a C for connected. If theres not a trailer itll display NC for no connection. Now well check the manual override. You can see we have the numbers show up from zero to eleven, and then well go ahead and turn the boost on to position one then well hit the brake pedal. That will let us know that we have signal from the brake pedal. So that looks like everything is working. And with that that will finish it for our install of part number 90885 from Tekonsha, the Prodigy P2 brake controller on our 2012 Toyota Tacoma.

Questions and Comments about this Video


I concur with Donna. The plug shown to be retrieved in the video (around the 30 second mark) is not the plug for the brake controller (shown at around the 50 second mark). I've fished around back there (including unwrapping the tape, etc.) and the brake controller plug isn't included in the same bundle. *2015 Toyota Tacoma TRD Off Road with Factory Tow Package.


In this video, when he pulls out the port it looks one way then when he plugs it in it looks like a different plug. l finally got to all my wires etc but am afraid to pull to hard on anything as they are a tightly wound mass and Im not sure if l have the right ones. Also do l have to pull off a cap or connector to get to the connection? Thanks again, Donna.

Etrailer Expert
Reply from Patrick B.

You don't want to pull hard, but it is OK to cut away some of the tape holding the bundle together. Just be sure you don't cut any wires. There are two plugs wound together there, you'll just have to separate so you can match the end to to the brake control harness. There shouldn't be any caps in place on the factory wiring.

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Employee Zack K
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Zack K
Employee Andrew L
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Employee Dustin K
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Dustin K
Employee Sue W
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Employee Jeff D
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