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Trailer Wiring Harness Installation - 2012 Toyota Sienna

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Toyota Sienna Wiring



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Installation of a Trailer Wiring Harness on a 2012 Toyota Sienna


Alright, today on this 2012 Toyota Sienna were going to install part #: 118498 from Tow Ready. First thing we need to do is open up the back hatch, get access to the hardware that holds the taillight set. Remove the hardware here and here. Through the taillight well pry out here on top and the sides and that will pop out. This little guide right here, that makes you pull out towards the back. Theres also a little pin right here.

Now to disconnect the wire harness from the taillight theres a little tab you push in and it comes apart. Here is a little tab right here and here. So were done with the driver side for now, lets go on the passenger side and repeat the same process. Now we can go ahead and start removing the interior panels to run our wire harness. We also need to remove the threshold here as well.

We can do it with slip of this plastic cap here and then we can reach and remove the hardware thats inside. We do have to pop these loose to remove them. There. Now we need to go ahead and loosen this panel up as well. We got the driver side loose so go ahead and repeat the same process to our passenger side.

Now we can go ahead and start running our wires. Well start with our green wires and our red wires and well thread these through here up into the taillight area. Well go ahead and match up our connectors here so we know which one goes where so well snap our wire harness to the factory harness like so. Well let that sit for now because the other half will eventually go back into the taillight. Well do the same thing for this plug here which will be our green wire.

Alright, now take our yellow wire, well rout that behind our panel, well run this over to the driver side. Alright, so make sure we dont hit any of the fasteners that hold the panel in place. And this will go to the two pronged plug on the driver side. Alright, now well go ahead and attach our ground wire with the ring terminal, well attach it to the body right here. Next wire well deal with is the red wire to black stripe, now connect it to our black wire that comes with the kit that will eventually get ran to the battery. Now well take that wire, lets leave it alone now, then well go ahead and find a place for to attach our module to the sheet metal on the inside. To give us a little more room were going to go ahead and remove the jack tube. Well take our wires, rout them behind the jack, clean off the area behind the jack and then attach our module. Okay, well take the adhesive back off the module and well install it where we cleaned the spot. Well take all our wires and tuck them behind the jack except for our 4 pole wire, well leave it outside for now. Now well take our black wire, we can start routing this to the outside. Well go ahead and run our black wire to the battery now. Well run it through this grommet right here, well pull it out, put a small slid in it and then push our wire through it. And then well continue running our wire up to the battery along the frame and up to the engine compartment. Now, well make sure we stay away from anything thats hot, like the exhaust or anything moving like the suspension components or the steering components we you get to the engine compartment. At this point well take a couple of zip ties and bundle up our wires. Now were going to go ahead and put our jack into place. At this point we can go ahead and reinstall the rest of the interior panels. Now were going to add a couple of loon clamps just to give us a little extra insurance against the exhaust here. Now well take a few minutes to go ahead and zip tie our wires out of the way, make sure theyre safe and secure. Now well go ahead and cut our wire a little bit short and then well go ahead and add our fuse holder, buck connector to our black wire. Well go ahead and cut our fuse holder in half, attach one into the buck connector. Now were going to go ahead and take our ring terminal and attach it to the positive terminal here. Reinstall our cover, then well go ahead and put a fuse into the fuse holder. So lets tuck our wire out of the way and well be good to go. And when youre ready to use the harness go ahead and pull it out, reinstall our jack cover and you can snap it into place, it will stay off the bottom here and then you can bring it out to your hitch and shut the hatch on it. Just make sure you stay away from the center latch and youre good to go. And pull out what you need until youre down to your hitch. That way it stays inside while youre not using it, Inaudible to get corroded up by the elements. Alright, next thing you do is to go ahead and test our connection. Well have a test light and then well go ahead and try it on a trailer. And with that, that will finish it for part #: 118498 from Tow Ready on our 2012 Toyota Sienna.








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