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Tekonsha Trailer Wiring Harness Installation - 2017 Toyota Sienna

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How to Install the Tekonsha Trailer Wiring Harness on a 2017 Toyota Sienna


Today on our 2017 Toyota Sienna we're going to be taking a look at and showing you how to install the Tekonsha T-One Vehicle Wiring Harness with 4-pole flat trailer connector, part number 118648. So here's what our wiring looks like when it's installed. We're going to have a 4-pole flat trailer connector, and it's going to give us all our required lights to go down the road, such as our turn signals, stop lights, and clearance lights. The built-in dust cover, we can use it to actually secure our wiring to our hitch, that way it'll be ready right here whenever we're ready to tow. Now that we know what it looks like when it's all finished up and installed, let's show you how we got it there. To begin our installation, we're going need to open up our rear hatch so we can gain access to the tail lights. Now each tail light is going to have two fasteners holding it in place.

Now, I'm going to use a 10 millimeter socket to remove those. We're going to go in and repeat that on the other side, as well. Now, when we go to remove our tail light, we're going to want to grab it as firmly as we can, and pull straight back. You don't want to go too much side to side, because there are some pins that are holding it in place. So if you can, you can grab the plastic edge towards the center, get your hand behind it, and pull straight back. Now, we're going to have two connectors inside of here, and each one is going to have a small tab on top, so we're going to want to push in on that tab, and we should be able to slide the connector out.

We're going to go and repeat that same thing on the passenger side, as well. Now, per the instructions, they are going to have you pull up a lot of panels on the interior of our vehicle, but we found an easier way to get our wiring installed. Now, per the instructions, the wiring would stay on the inside of the vehicle, but we're actually going to be mounting our wiring to our hitch on the outside. So, I'm going to start on the passenger side, and I'm going to take a piece of airline tube that I had laying around, and you can use whatever you have available, even a coat hanger'll work, but I'm going to take it and go in between my bumper here and the body, and I'm going to feed this down until it comes out the bottom, underneath my car. So, where my airline came out of the bottom of my bumper, I'm going to take my green wire with the two connectors, and my red and brown wire with the two connectors, and I'm going to take a little bit of electrical tape, and I'm going to tape it to the end of my airline tube. Now we can go in and grab the other side of the airline tube, and start pulling it up. I'm going to take a little bit of patience in help guiding it up. Now that our connector's up top, I'm going to go ahead and remove the tape and the airline tube.

We'll notice that the connectors are going to look very similar to the ones on our vehicle, and we're going to want to plug in the female into the male end, and the male into the female end. Now, we're going to have a four and a three prong socket plug, and you're going to want to make sure you plug them in to the corresponding ones. Now coming out of our converter box, we should have a white wire with a ring terminal attached, and that's going to be for our ground. Now, they do provide us with a self tapping screw. I'm going take the self tapping screw and secure it to the floor. Now, we're also going to have a black wire coming off our converter box, and this is going to need be ran up to our battery.

Now, they do provide us with a length of wire that we can attach to it. So, I'm going to take a butt connector, and they do provide us some in our kit, but I'm going to be replacing this with a heat shrink butt connector, that way there's just a little bit more protection against moisture build up and corrosion. On the end of my wire, it's already pre-stripped, so I'm going to insert it into my butt connector and crimp it down. Now I can take the length of wire that they provide us in our kit, and I'm going to strip back one end of it. I'm going to go ahead and put it into the other end of my butt connector and crimp it down. I'm going to be using a heat gun to shrink down my connector. I just want to mention you want to be careful not to char the wire or the connector itself. Now, we're going to find a spot to mount our converter box, and they do provide us with some double-sided foam tape, so we can stick it to a flat surface. So I think I'm going to mount mine up here, underneath the fascia behind the wheel well, so it's up and out of the way. I'm going to take a rag with just a little bit of cleaner, and make sure the surface that I'm going to put it on is nice and clean. Then I can take my double-sided tape, I'm going to take the backing off, I'm going to stick it to the back of my converter box. I'm going to push firmly to make sure it sticks. Then I can take the other piece of the backing off, and we're going to reach up and press it against the side of the body, firmly, making sure that it sticks. Now we are going to have to get our 4-pole wiring, our yellow wire and our black charge wire, over to the driver's side. So again, I'm going to take a piece of airline tube, and I'm actually going to come in right here where I'm going to mount my wiring, and I'm going to run it behind this panel. I'm going to go behind, underneath the panel, and come across until it comes out the other end. I'm going to take the end of all three of my wires, and I'm going attach it to my airline tube. Just going to take a little bit of electrical tape, and secure it. Now we can go ahead and start pulling it through, help guiding it up behind the hitch, and above that panel. Now, since my 4-pole needs to come out right here, I'm going to go ahead and pull my wires through, and let them come down, and then I'll let my 4-pole hang right here. So I'm going to take the tape off, and pull all the excess wiring out for my 4-pole, and then I can continue to work the yellow and black wire over to the driver's side. Now inaudible 00:05:58 on the driver's side, very edge of our bumper, we're going to have two fasteners holding that panel up, and I'm just going to remove these two just so we have a little bit of flex to gain access to the driver's area over here. Now, we're going to be using a 10 millimeter socket to remove these bolts. So we can actually take the panel, and we're just going to pull it down slightly so we can get our wires tucked behind there, and again, we're only going to be moving the yellow and black wire over all the way to the left. The 4-pole is going to stay in the center of the vehicle, where the hitch is. Then we can put the panel back in place. Now over here on the side, we can go ahead and pull this section down just a little bit, as well. And we're going to do the same thing that we did on the passenger side with bringing an airline tube so we can get our yellow wire up to our tail light. Now our charge wire, I mentioned before, we are going to have to run it up to the battery. Now everybody's going to do this a little bit differently, but just want to mention you want to stay away from any heat sources, like the exhaust, or any moving parts. So I'm going to ahead and run my wire, and then I'll show you how I routed it. I ran my power wire underneath the cover, came out, went up and over my muffler and my rear axle here, and I followed down along my fuel tank, along the outside edge of the frame rail, coming out right here, going underneath this cover right here, and finally coming out right behind the engine. Now, we're going to need to run this wire up to the battery, so let's go ahead and go up top, and I'll show you how we're going to get it there. I'm going to take a piece of airline tube, again, and I'm going to route it down through the engine compartment til I can meet up with that black wire underneath. Now let's go back down underneath and attach our wire. I'm going to take my wire, I'm actually going to insert it into my airline tube, and then just put a small bit of electrical tape so I don't have to worry about it falling out. Now we can head back up and start pulling it up. Now, when you pull your wire up, you want to make sure that you pull all the slack out, and it's always a good idea to double check by going underneath and make sure it didn't get waded up, 'cause that could cause potential problems later on down the road. I'm going to zip tie my wire to some existing factory lines right here, just so I don't have to worry about it falling back down, and help keep it secure. And go ahead and strip back the end of our black wire, and we're going to take another one of our yellow heat shrink butt connectors and crimp it into place. Now our wiring kit is fused protected, so they're provided us with a fuse holder, and it's one big loop, so I'm going to go ahead and cut it straight in half, and I'm going to strip back both ends. Now on one of the ends, I'm going to put it in the butt connector that we just applied to the black wire, and on the other end, we're going to take the provided ring terminal, slip it on, and crimp it into place. Now we're going to attach our ring terminal to the positive post of our battery. So we're going to need to remove this nut right here, and I'm going to be using a 12 millimeter socket to remove it. So once we have the nut removed, we can take our ring terminal, slide it over the post, and then reinstall the nut. Finally we can put our 15 amp fuse in place, put our dust cover on, and we can start to tidy up any wires that we may have left loose. Go ahead and plug our lights into our tail lights, line up our tail lights, and put them back in place. Now the last thing we're going to need to do is to test our wiring, so I have my 4-pole tester here, and if you need to pick one of these up, you can pick one up on our website using part number I26. Now I'm going to garb an extra set of hands so they can run my lights and I can verify that everything's working properly. If you'd turn on the headlights, please. Looks good. Left turn signal. Right turn signal. The brakes. And finally, the breaks and both turn signals, please. Looks like everything's good and we're ready to hit the road. That'll finish up our look at the Tekonsha T-One Vehicle Wiring Harness with 4-pole flat trailer connector, part number 118648, on our 2017 Toyota Sienna.


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Info for this part was:

Employee Joshua S
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Joshua S
Employee Jacob T
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Jacob T
Employee Kathleen M
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Kathleen M
Employee Andrew L
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Andrew L
Employee Dustin K
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Dustin K
Employee Chris R
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Employee Cole B
Installed by:
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Employee Randy B
Test Fit:
Randy B
Employee Brent H
Test Fit:
Brent H
Employee Robert C
Test Fit:
Robert C
Employee David F
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David F
Employee Ryan G
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Ryan G

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