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Trailer Wiring Harness Installation - 2014 Toyota Sienna

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How to Install a Trailer Wiring Harness on a 2014 Toyota Sienna


Today in our 2014 Toyota Sienna, we'll be installing a Tekonsha T one vehicle wiring harness with a four pole flat trailer connector. Part number 118498.Speaker 2: Okay, right now we have our wire drake out of our trunk area to the side of our latch. We're going to go ahead and close our trunk. As you can see, we have an adequate length wire to hang down here next to our hitch, to connect to our trailer. Once we hook up to our trailer here, and plug our lighting in our electrical connector, from our trailer into our wiring harness, then we're ready to hit the rode. When we arrive at our destination, we unhook from our trailer, and we're ready to store our wiring back inside the vehicle. We'll plug the dust cover back over our connector here.

Open our hatch back up. Then we can store it inside our jack storage compartment here. Open the door, drop it down inside, and it's up and out of the way. As you can see, we still have a completely open trunk. We don't have to worry about our wire being damaged by our cargo being loaded in and out of the vehicle. These are the wiring harnesses that the kit comes with.

This is our four pole flat trailer connector here, so we'll have all of our required lighting functions, as by law, on our trailer. It'll plug directly into our factory lights here. No cutting or splicing required. We'll go to this converter box here, which will isolate our trailer wiring from our vehicle's lighting system. That way, if there's any problems with back feeding of voltage or a short in our trailer, it won't damage the expensive electrical components in our vehicle. This box is powered directly from our vehicle's battery.

We'll go to that with this wire here to this fuse holder, which the tenium fuse will go into. We have several bud connectors and a ring terminal to make our attachments, and some zip ties to secure wiring along the way. There's a self capping screw to ground our wiring harness to the vehicle's body. Begin your installation by opening our rear hatch. Remove the two 10 millimeter screws on both tail light assemblies, to get them removed. Those are removed, and we'll grab our tail light assemblies and pry them away from the vehicle.

We'll disconnect our connectors by pushing here on the tabs. We'll set those aside so it's not damaged. Do the same on both sides. Now we'll remove our cargo hooks on our threshold plate. Pry up on this cover here to get access to the 10 millimeter bolt. Okay, do the same on the other two. We have our three cargo hooks removed. We'll move our threshold plate and pull up on it. We're going to use the trim panel tool. We'll set it aside. We're on the passenger side now. We'll remove our jack tools. Door cover. We'll set it aside. On our driver side, we'll take out our second row, middle seat from it's stored position. Set it aside. Now, we'll pry off our interior panels a little bit, so we have access to fish our wires through. We'll do that on both sides. Now we'll take our module and the double sided tape that's provided. We'll apply to the back of our module. Peel off the back side of it. We're on the passenger side of the vehicle right now. In the jack storage compartment, we'll place this right here on this flat surface. We'll push back on the tape. Make sure it's nice and secure. All right, good. Now, we'll take our wire connectors here. The green wire, the red, and the brown wire. We'll feed them through the access hole. Like so. We'll make our connections. The green wire will go to this green wire here. We'll plug the male into the female end of the vehicle side. Once they clip into place, we know we're good. We'll let those dangle right here for now. Once we have our two connections made on the passenger side, we'll run this connector over here that has a yellow wire over to our drivers side. Making sure it's behind our trim panel piece here. Come up behind this trim panel, and out through the access hole. We'll make sure we plug in the connector. There's two, the male end and the female end. Just like that. Now we're back over on the passenger side again. We'll take our red wire that goes through modules, our power wire. Strip off more of the insulation. Take one of our included yellow bud connectors. Stick it on it. We'll crimp it on down. Make sure it's secure. Take our black wire, strip the insulation off. Stick the other end of the bud connector. We'll crimp it down as well. Make sure that's secure too. Once it is, we'll wrap our connection up with some electrical tape. Now we'll take our black wire and attach this to the red wire. Make sure it's routed behind our panel here. All routed along the yellow wire to the drivers side, just like we did before. We'll come out the access hole. Now we'll drop down a whole wire that will come out behind our bumper. We'll tape the end of our black wire to it. We're doing this so we can get the wire outside the vehicle. Then run it up to our engine department so we can hook it to our battery. Have that taped up, grab the end of our pull wire, and pull it down. Right where my finger is, there's a 10 millimeter bolt that's holding a bracket that holds the jack in place. We'll take this bolt out. Okay, now we'll grab our ring terminal, which is on the white wire. Put the bolt through it, and we'll reinstall the bolt. We'll tighten that back down. That will give us a nice solid ground connection for a lighting system. With our ground connection made, that's all the connections that we need to do back in our compartments. We'll put the panels back in place. Clips in nice and tight. Weather stripping sits on top of it. Now we'll zip tie our wires to these raised sections with holes in the middle. Right below where our cargo hooks went. Just so they don't fall down, and aren't in the way of anything. Okay, we'll cut off the rest of the zip ties. Push our drivers side panel back in now. We'll slide our center panel back in place now, and reinstall our cargo hooks. Okay, we'll slide this back down on the end like so. Push back down, put the hook back down. Repeat the same process for the other two. Now we're pulled back in our tail light. We're on the passenger side right now. Let's plug our two connections back in. We'll push our light back into position. Okay, once you have it pushed back into position, we'll reinstall the two screws. Repeat the same process for the other side. We went ahead and routed our power wire to the front of the vehicle. Making sure we avoid any moving parts, or sources of heat such as the exhaust. Our power wire came out in this plastic trim panel here. Right in front of our hitch. We zip tied it up to the body here, went above our sub frame, over our gas tank thorn neck, and then we secured it to our fuel tank straps. Then I went up and over this panel. Comes out towards the front here, up and over our sub frame here before we fish wired it up into our engine bay. Taking off our pull wire. Another wire. Strip off some of the insulation from it. Take the yellow bud connector, place it on the wire, crimp it on down. Take our yellow fuse holder . If you see it's a continuous loop of wire, and we'll make a cut right in the middle. We'll strip back the insulation on both ends. On one end, we'll place the ring terminal. Crimp that down. The other end will go to our bud connector on our black wire. We'll crimp that down as well. Make sure it's nice and secure. We'll wrap our connection in electrical tape. Now we'll take a 12 millimeter socket, and remove this nut from our positive battery terminal. I want to point out, we don't have our fuse installed right now. Even though we're hooking up with our battery still connected, there will be no power going to our system, and we're not damaging any components. Place our ring terminal over the stud, and reinstall our nut. Now we can safely install our fuse into our fuse holder. Use the provided 10 amp fuse. Push in, and we'll close the dust cover up over it. Now for the installation to be complete, it's a good idea to test our wiring before we hook into our trailer to make sure everything's working properly. Now we have our four pole flat tester plugged in. It's part number 126, if you want to purchase one from our website. We have our headlights turned on. As you can see, those are working. Do our left turn signal, right turn signal, step on our breaks, and you can that's working as well. That means that all the functions that we would need to tell our trailer are working properly.That completes our installation of the Tekonsha T one vehicle wiring harness for a four pole flat trailer connector. Part number 118498 on our 2014 Toyota Sienna.


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