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Trailer Wiring Harness Installation - 2001 BMW X5

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How to Install a Trailer Wiring Harness on a 2001 BMW X5

Today on this 2001 BMW X5 we are going to install part number 119190. We are also going to use part number 118151 and that is going to be the install kit. The first step is to get inside the vehicle because that is where the wiring harness is and basically what we are going to do next is remove the interior panel before we can get to the wiring itself. We are going to take out the two side panels. The first thing we are going to do is find a wire harness that actually goes directly into the tail light and there is a socket that goes into it so disconnect that, there is a little tab right in the middle. 00:35

The first thing we will do is test for the functions of the wire. We are going to do one circuit at a time. First off we will start with the running light circuit and we are going to test on the inside of the plug and we will see which color does what. It looks like it is going to be the gray and purple wire so we are going to take our running light wire from the modulite which will be brown and we are going to connect that to the wire. We will be using the quick splice to do that with and that will be part number 564. 01:05

We will move on to the next circuit. The left turn looks like a green and blue wire so the left turn for the module is going to be yellow and we will hook it up the same way we did before. Next we will look for the stop light wire. Off, on, off. It looks like the brake signal is going to be brown and black. Our stop light wire on the module is going to be red. Reinstall the wire harness back into the tail light and take the white wire and ground it to the body. Use a ring terminal to do that with. Next we will deal with the green wire and that is going to go to the right turn signal so take the green wire and route it over to the right side of the vehicle along the factory wire harness. We are looking at the passenger side and disconnect the tail light harness. Just like before we will test for the right turn signal. The right turn looks like the blue and brown wire. We can reinstall the wiring back into the tail light. Back over on the driver side of the vehicle we will hook up the black wire coming out of the modulite and basically we are going to take our wire from the 118151 kit and we are going to connect the two together and the black wire is going to be ran to the battery. Leave that wire alone for now and lets mount our module up somewhere inside the vehicle. There is a nice spot right here and they do not come with the kit but we will use a couple of cheap ones just to hold everything in place. 02:59

To get access to the battery we are going to have to remove the spare tire. Take this and roll it off to the side and now we have access to the battery. What we will do now is take the black power wire to see how much length we need to go down to the battery. We did not use much but we will cut off our excess and we will follow this a little bit like the green wire, that will be about right, and on the end of the black wire we will install the fuse holder. In one side we will add the ring terminal and the other side we will add the butt connector. Add this to the black wire and now take the ring terminal and we are going to add this to the positive side of the battery. Sneak the lead underneath the structure right here however I think we will put a notch right next to the plastic case because we will run the wires straight out that way we have easy access to the fuse if you ever change it. Now we are going to install the 15 amp fuse 118151 kit comes with a 10 amp fuse and that will be replaced with by this 15. We will take come zip ties now and zip tie the wires safe and out of the way. At this point we can reassemble the interior of the vehicle. To use the wire harness pull a little bit of it out and shut the door on it because the seal is thick enough where it will not hurt anything when you shut the lid. Just to make sure you stay away from the latch, pull out what you need to go out to your hitch. With that that will finish our install of part number 119190 and part number 118151.

Info for these parts were:

Employee Zack K
Video Edited:
Zack K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Andrew K
Video by:
Andrew K
Employee Dustin K
Video by:
Dustin K
Employee Nicholas E
Test Fit:
Nicholas E
Employee David F
Test Fit:
David F
Employee Cole B
Installed by:
Cole B

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