Tekonsha Upgraded Modulite Vehicle Wiring Harness Kit Installation - 2019 Toyota RAV4

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How to Install the Tekonsha Upgraded Modulite Vehicle Wiring Harness Kit on a 2019 Toyota RAV4


Hi there, RAV4 owners. Today on your 2019 RAV4, we're going to be taking a look at and showing you how to install the Tekonsha's Modulite Vehicle Wiring Harness Kit.This is what your tail light wiring is going to look like when it's installed. All your components are hidden inside the vehicle, so you'll just have your four-pole flat trailer connector here at the back. Your four-pole flat trailer connector will provide you with all the necessary lighting you need to tow your trailer, including your left turn signal, right turn signal, tail lamps, and brake lamps, keeping you DOT compliant in all states.What's nice about this particular unit is that it uses a module to produce all of the signals back here at your four-pole connector. The module monitors all the signals on your vehicle. The module has its own power wire to be able to produce these signals.

What I really like about that is that if there's any faults on your trailer that may cause a short circuit or an overload, the module inside will detect this and shut those down. And in the event it's unable to shut those down in time, since the module's producing all the circuits and has its own power wire, the inline fuse on the module's power wire will open and prevent any damage occurring on the vehicle side.The module can produce up to 2.1 amps for your stop and turn on each side, which is going to be adequate for any of your medium and even your larger size trailers. On your tail light circuit, you'll have a maximum of 7.5 amps, which is pretty large amount of amperage. You'll be able to light your trailer up kind of like a Christmas tree, you have so much power available. The included dust cap that's preattached onto our connector will keep out any dirt and debris and can also be wrapped around your safety chain loop to secure it to keep it up off the ground.

The kit comes with everything that you'll need to get it installed. Let's go ahead and walk through that together, so you'll have the confidence to do it at home.We'll begin our installation at the back of the vehicle by removing both the passenger and driver side tail light assemblies. You'll want to open your hatch and remove the plastic cover located next to the assembly. Simply pull the cover off to remove it. Use a 10mm socket to remove both bolts holding it in, and then pull the tail light rearward to remove it.

If you're having a difficult time pulling the tail light assembly rearward, you can use a trim panel tool to help pry it towards the rear. Once it's popped out, we'll go to the back side and disconnect our electrical connectors. The bulbs will twist to remove. The connectors will press in on the release tab and pull the connector off. We'll now do the same thing on the opposite side.We'll begin by making our connections on our driver side.

We'll be using the yellow, the red, and the brown wire to make these connections. We'll start with the yellow wire, which is our left turn signal. This is going to quick splice onto the black and green wire going to the turn signal bulb. To use the quick splice, you simply slide over the wire you want to tap into, take the wire you want to add to it, slide it into the single hole on the back side, and then use a pair or channel locks or pliers to squeeze the center splice down. Then take the cover, click it into place on the side and then click it into place on the top. We then use the same process to connect the red wire from our module to the red and black wire on the three-wire connector and the brown wire attached to the green wire on the three-wire connector.We'll now need to use a fish wire to get some of our wiring pulled up and down through body panel here. A fish wire can really be anything that is rigid enough to where you can keep it straight but flexible enough that you can move it around. We're using some air line tube. If you don't have any air line tube, a coat hanger works really well. You can untangle a metal coat hanger and usually get that down to come out below.Once you've pushed it down, we'll have one end sticking out the bottom. We're going to go ahead and attach our green wire to it first. Our green wire here is going to run over to our passenger side. So we're going to take our fish wire. We're going to tape it to our green wire and then just feed it down and use our pull wire, the fish wire that we made, to get it to come out down below. Now that we've fed our green wire down, you want to pull it all the way down because we're going to be using the green wire to feed our black wire that comes in our kit back up to connect to the module.We're going to go ahead and connect our black wire. I like to make it as far up the green wire as I possibly can to make sure that I've got enough green wire left to pull it back down, once we've used it, to feed our black wire up. Just going to go ahead and tape it just like we did with the other wire. We're now pulling our green wire up and we just want to pull it up just enough to where we can get to our black wire and then pull up some excess black wire. We can now separate the two and then pull the green wire back down.We'll now connect the black wire we ran up to the black wire coming off of our module. We'll strip back our black wire; I like to strip a little bit more off the module side. We'll then crimp the two together. Instead of using the yellow butt connector that comes with our kit, we've upgraded ours to a heat shrink butt connector. This will keep out any moisture ensuring a long-lasting corrosion-free connection, and then we'll use a heat gun to shrink down the butt connector.We then pulled up a little bit more of the black wire that we fed through because we're going to be using the black wire now to pull our four-pole connector down towards the bottom. We're going to use the exact same method. We're going to tape it to the black wire and then pull it down. We'll then pull that through just like we did before and separate our black wire from our four-pole connector.We went ahead and took our wiring and zip-tied it up to make it nice and clean and to keep everything out of our way. We used the zip ties that came in the kit to clean it up. We'll now hook our ground wire up. This is the white wire coming off of your module and it has a ring terminal on it. Use the included self-tapping screw, slide it through the ring terminal, and we're going to secure it right here behind our driver side tail lamp assembly. We'll now take the included adhesive backing. We're going to place it onto our module, then peel off the other side and we're going to secure the module down below our headlight by just sticking it to the sidewall here. You'll want to hold it there for about 25 seconds to ensure good adhesion.We're now going to have to get our passenger wires run. We're going to do our pole wire trick again and get our wire prepared. We're now back underneath. We're going to take the green wire and the black wire that we drop down, and we're going to run those over to our passenger side. Your green wire is not going to be long enough to get to the destination that we need it to, so you will have to extend it. You can pick up additional wire here at etrailer.com.We're going to just route it behind the bumper fascia here to try and stay away from our exhaust as much as possible. And just like we did on our driver side, we're going to use our pole wire trick to get both the black wire and the green wire pulled up behind the passenger side tail light assembly. We'll now pull it up just like we did. Can now take our green wire, we're going to bring it up and out. What I like to do at this point is zip tie my green wire and my black wire to our harness here. That'll keep the slack pulled up tight so we don't have to worry about it falling back down and potentially leaning against our exhaust.We pulled those up, going to angle them towards the rest of our wiring and get those secure. We can then take our green wire and cut it to length. It's going to be hooking to the black and green wire on our turn signal bulb here, and just like we did on the other side, we're going to be using the quick splices. Again, we'll fold over the locking cover and we've completed our connections to our tail lights.We'll now need to access our battery to make the connection for our power wire, which is the black wire we ran over to our passenger side. To access your battery, we'll need to lift up on the covers we have here in the back, pull this panel up. I'm going to drop this little panel down and pull it out, and then this whole panel here is all going to come out. There's a little handle grip here. You can pull that out and then pull that out as well. Our battery's found right here, and if we go up the back here, you'll feel a grommet. That grommet goes to our tail light assembly right here. So we're just going to push that grommet out, take our black wire and we're going to feed it through that hole.We'll then take our grommet. We're just going to use a pair of snips and we're just going to cut a groove down the center of it, and that will allow us to reinstall it and wrap it around our wire. We'll simply slide it on our wire there, then just poke the grommet back in. If you want, you can further seal it with a little bit of black silicone on there. It should seal pretty tightly though with your grommet.We can now take the fuse harness that comes in our kit. I'm going to go ahead and cut the loop in half and then strip back each end. On one end, we're going to be placing a ring terminal, and on the other end we're going to be placing a yellow butt connector. This time we are going to use the butt connector from the kit because it's inside the vehicle, so we don't need the extra protection that a heat shrink butt connector gives us since it's not exposed to moisture and the elements.We'll then pull up on our plastic cover there and press the release tab here to pull that up. That'll expose our battery-positive wire. We'll use a 12mm socket to remove the nut. We'll take our fuse harness and slide the ring terminal on top and then reinstall the nut. Slide it off this way, so that way we can more easily get our red cover back installed and then put our red cover back on top. It may not want to slide on like it used to. You do have the option to trim it to make it fit. Looks like we're going to have to do some trimming here in this area to get the cover back on.Gone ahead and trimmed away part of our plastic cover there so our wire would fit. We can then take the black wire that we ran in. We're going to trim it to length. I always like to leave a little excess for further accessories, or in the event of a repair, it'll make that a little easier on you. Strip back the black wire and then crimp it onto the other side of your fuse harness. We can now install the fuse and then test it out to make sure everything's working properly.To test it out you can either plug it into your trailer, or you can use a tester like the one we have here. If you'd like to purchase a tester, we have them available here at etrailer.com. You want to make sure you have your left turn signal, right turn signal, tail lamps, and brake lamps. With everthing working properly, we can reassemble the panels in the back of our vehicle, reinstall our tail lights, we're ready to hit the road. With our covers back in place, we're all set. That completes our installation of Tekonsha's Modulite Vehicle Wiring Harness Kit on your 2019 Toyota RAV4.


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