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Trailer Wiring Harness Installation - 2014 Honda Odyssey

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How to Install a Trailer Wiring Harness on a 2014 Honda Odyssey

Today in our 2014 Honda Odyssey we'll be installing Tow-ready T1 vehicle wiring harness, part number 118521. To begin our install we'll first need to go ahead and open up the rear cargo door. Then we'll remove the rear threshold. To remove the rear threshold, we'll first need to remove the two tie-down fasteners, one located on each side. Then, using an interior trim panel tool or a flat-blade screw driver, we'll get underneath the threshold and release the fasteners underneath, as we pull out and up on the rear threshold. Now once we've released the fasteners underneath, we can go ahead and remove the threshold and set it aside for reinstallation later.

On the drivers side, we need to remove the cargo hook at the top of the interior quarter panel.Next we'll remove the access door located behind the third row seating here on the drivers side. We'll go ahead and pull out on the quarter panel and release the fasteners underneath just like we did the threshold. We'll be able to take our new wiring harness and feed it behind the quarter panel, between the two interior quarter panel pockets. The white connectors will come out through the excess panel hole where we removed the cover earlier. We'll be using the manufacturer port here.

If theres already an electrical connection point in this port, we'll remove it first, then plug our harness into the manufacturers fuse box, plugging the other end of the wiring that we removed from the fuse box, into the other end of our T connector.However, for this application theres nothing in the port so we can plug directly into it and feed the other end of the T connector out of the way. Next we'll move to the back of our quarter panel that we removed earlier, and take the white wire with the pre-attached ring terminal which will be the ground for a new wiring harness, and ground it to the vehicle body. Now for this application, theres a manufacturers ground located next to the threshold behind the quarter panel. We'll go ahead and remove the ground stud, put it over the white wire ring terminal, and then reinstall the ground stud back in the manufacturers position. Now with the wiring harness grounded, we'll go ahead and take the grey connector of the wiring harness and plug it into the converter box.To secure the converter box, by removing the two-way adhesive, looking for a clean flat surface to adhere it to, and then putting the converter box into position.

Now with that done, the four-pole harness will simply run down and underneath the interior paneling, and we can go ahead and reinstall it. With the quarter panel and threshold reinstalled, we'll now go ahead and reinstall the fuses into the fuse box for our new wiring harness. Starting with the 10F fuse, we'll plug it into the number 8 position as per the diagram on the back of the fuse panel cover. Next, we'll install a 7.5 amp fuse into the number 2 position, and the number 11 position. Now with all our fuses installed, we're ready to go ahead and test our new four-pole wiring harness.

Using a test light, we can simply go ahead and remove the four-pole harness cover and put the ground clamp over our test light, over the white wire terminal. The brown wire terminal will be our running light circuit, yellow wire terminal will be the left turn signal, left break, and green wire terminal will be the right turn signal, right break. Now we know our four-pole harness works so lets go ahead and show you how to use it. Simply open up the rear cargo door, take the four-pole harness, run it towards the center of the vehicle and down to the hitch. Note, be careful to stay away from the vehicle cargo door latch as pinching it in the latch can harm the wire. However, the weather stripping is thick enough that it won't harm the wire and we can simply close the rear cargo door on it. Then we'll pull out the necessary wire to run to our hitch accessory, and we're ready to hit the road. That does it for the install of the Tow-ready, T1 Vehicle Wiring Harness with four-pole flat connector, part number 118521 on our 2014 Honda Odyssey. .

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Employee Joe V
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Joe V
Employee Nicholas E
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