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Trailer Wiring Harness Installation - 2003 Acura MDX

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How to Install a Trailer Wiring Harness on a 2003 Acura MDX


On this 2003 Acura MDX we are going to be installing wiring harness part number 118336. We are in the cargo area of our MDX. We want to go ahead and locate the port that we are going to be plugging our wiring harness into. The wiring harness located inside of the cargo area here is actually right beneath this metal threshold piece here. So, we need to remove a few things to gain access to it. We are going to start by doing that. Next we will remove the middle threshold piece. If you come to the forward side of the threshold piece here, you will see that there are two black push pins that are holding it on this facing. So to remove those, we are going to be using a basic rivet removal tool. And what you are going to want to do is just slide it under the outer ring of the fastener. You take and just pop that right out. And then you will want to move to the topside of the threshold piece and there again are unexposed fasteners just like those that were on the front facing. So we will take the same rivet tool and go ahead and pry it underneath there and pop those out as well. 0:58

With those loose, we can go ahead and take and pull it away. If you come back into the front side, you can see our port that we are going to be plugging our wiring harness into. The port is actually connected into a holding tab right here. There is a small release button here on the top. You just want to press that and then pull away. Next, just go ahead and take our wiring harness and we simply need to go ahead and plug that into the wiring harness port and that is really about it. With that, we are going to go ahead and just reuse the fastener that is holding the cap on. Again I am going to take my removal tool, slide it in under the red holding clip which is basically another push connector just like we had on our middle threshold piece. To remove the mounting clip, we just want to take and use a small flat head screw driver. And there is just a little tab that is catching under the cap. Lift up a little bit and push away. You can slide that right out of there. We can just take and remount it onto the wiring harness side. 1:56

The 4-pole end is actually going to stay stored inside this cargo area. You can see that we have a converter box that is hooked into the harness. So we want to try to hide it as much as possible. And what we can do is take and actually feed it back through this small opening, where the wires for the wiring harness port are following through. And from there that is really all there is to it. Go ahead and use one of the provided zip-ties if you like to tie up these loose wires here. And then with everything reinstalled, we can quickly show you how we are going to use this 4-pole when we want to go ahead and tow. And again with this being stored inside the vehicle, we just want to go ahead and pull it out the cargo door and make the connection to the trailer. We can go ahead and shut the door on there. You do not have to worry about it being pinched because the weather stripping will prevent the harness from getting pinched. And that is all there is to it. That will conclude the installation of wiring harness part number 118336 on a 2003 Acura MDX.


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Info for this part was:

Video Edited:
Zack K
Video Edited:
Andrew K
Installed by:
Jeff D
Video Edited:
Joshua S
Test Fit:
Nicholas E
Video Edited:
Jacob T
Video Edited:
Andrew L
Installed by:
Cole B
Test Fit:
Shane T

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