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Trailer Wiring Harness Installation - 2015 BMW X5

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How to Install the Trailer Wiring Harness on a 2015 BMW X5


Narrator: Today our 2015 BMW X5 will be having a look at and installing the Tekonsha ZCI Circuit Protected Vehicle Wiring Harness, part number 119250KIT. Now, what I really like about this wiring harness compared to others on the market, is the fact that when we install it, we don't have to worry about cutting or splicing into any of the wiring on our vehicle at all. Plus, another thing I really like about this wiring harness, if I we're to get another vehicle further on down the road, I don't have to worry about buying another wiring harness. I could easily remove this from my vehicle and install it into a new one because there is no cutting or splicing, and it's not vehicle specific. It works with any vehicle out there. This is a zero contact interface. All you have to do is fold these connectors here over the wires that has your signal that you're using. In this case, this is a tail light wire that we're using.

This will pick up the signal from your vehicle's factory wiring harness without any modifications required to the vehicle at all. This is especially great for high-end vehicles such as this BMW X5 where this is no plug-and-play wiring harness available for it. All right, so with our wiring installed, we have the great ability here to store it inside our rear cargo area. You may or may not have this much room. It just depends if your vehicle has a spare tire or not. When it's not in use, then close or cover her on up.

It's completely out of the way. We don't have to worry about it becoming damaged when we're loading cargo in and out of our vehicle. When we want to tow our trailer, we just open it on up, grab our wiring, close the cover on down, take our wiring harness here, route it behind our lift support for our tailgate, close the tailgate on up, close her hatch on down, and it's forward inaudible 00:02:02 flat wiring gives us our tail light and running light function off of our brown wire, our left turn signal and our left brake light off of our yellow wire, our right turn signal and our right brake light off the green wire. Now that we've gone over some features, we'll show you how to get it installed. All right. To begin our install, we'll start by opening our hatch and lowering our tailgate.

We'll move our side panels just by grabbing with the handle pulling down. We'll set them aside. We'll do the same on the other side too. Now I'll unplug our tail light connector. There's a tab right in the middle.

Press in on the tab and pull back. It's unplugged. Same way on the other side. Now we'll open up our cargo cover. Now we'll move this cover here. It's held in place with five 8 mm screws. Okay now we have our head lights turned on. We will use our test light to determine which one of our wire here controls our tail light circuit. What we'll do is called a Back Probe Technique where we come up with a test light through the back so we don't damage our terminals. So, we have this gray wire with a purple stipe. That is our tail light circuit. We'll make our connection off of that. We'll turn our head lights off so we don't drain our battery. The connector we're using for our tail lights is the one that's brown and says tail on it. We will flip open this connector. Okay, we want to make sure that this arrow here points towards our connector and not away from it. Okay, we'll make sure our wire sits inside these grooves. Then we'll close the connector on up over it. Now we'll turn our hazards on and determine which one of our wires is our turn signal. Okay, we've determined our black wire with the white stripe is our turn signal wire. Turn our hazards off now and we'll make our connection. And since we're on the left side, we'll use the one that's marked left turn. All right, we went ahead and routed our right turn signal connector right here down through this hole, through the compartment for our battery tray, and went up underneath the other compartment on the other side. So, here's where our right turn signal connector is now. We turned our hazards on again, so I'll test it for test light. Just find out which wire is our turn signal. Okay. It's our black and gray wire. We'll turn our hazards off now and make our final connection. We'll get our wire inside, and I'll snap it down shut. We went ahead and bundled up our other connector here. This is for a stop light signal if your vehicle has a three-wire circuit. Ours has a two-wire, so this is not necessary. We also bundled up the slack in the wire for our tail light circuit. This way we have a little bit tidier of an install. All right, the black wire that comes off of our control module. This is our power wire. We're going to stripe off a little bit more of the insulation here. Take one of the buck connectors that comes with our kit, crimp it on. Now we'll take about a foot of our black wire that comes with our kit, strip off the insulation on both ends, place one in the buck connector. Now we'll take our fuse holder, take off the pre-stripped insulation, both ends. Chip off a little bit more. Now in our fuse holder, we'll place on a heat shrink buck connector on one end, the other end we will place on the ring terminal. Now we'll connect this to the extra black wire that we added. Now we'll use a heat gun. We have these available on our website if you'd like to purchase one. Just seal up the buck connectors. Okay, now we need to ground our module with our ground wire here with this ring terminal. We're going to do it on this stud right here, and that will really don't drill any holes in our vehicle. To do that, we'll just remove this 10 mm nut right here, place the ring terminal underneath it, and reinstall the nut. Okay, now we'll take our module, a zip tie, run it through the hole. Our double sided tape, peel back one end, stick it on to our module, press down firmly, remove the other side, and we'll secure it to this bracket here next to our amplifier. Run the zip tie through the hole first, take the module, press against the bracket, and tie down the zip tie. This way, if the tape ever fails, the zip tie will hold it in place. Okay, now before we plug our tail light connectors back in place, we're going to take some of this foam tape and wrap it around our connectors. This will prevent them from ever coming loose, but yet not damage our wires. We'll do this for all three of our connectors that we used. We'll plug our connector back in place. We'll pull back inaudible 00:09:13 here and we'll do the same on the other side. Our power wire and our fore-poll flat wire, we went ahead and routed those down just like we did the connector for our passenger side turn signal, and we have our fore-poll flat. We'll just drape this over our tail gate. Our fuse holder, we will now make our connection to the positive terminal of our battery. This vehicle is a diesel. The main battery, the one we're going to be using is the one that's on the driver's side. So, we'll lift up on our cover here, there's a 10 mm nut right there, we'll remove that. Now we have no fuse, and our fuse holder at this time. Place the ring terminal over the stud, reinstall the nut, tighten back down. Now we'll install our 15 amp fuse in the fuse holder, and close up the dust cover. Okay now we'll place our cover back on to our batteries. We'll reinstall our side panels now. Okay now we need to be inside our vehicle in order to do our programming procedure for the ZCI module. To do that, we need to go through each of our functions separately, one at a time, for five seconds. So, I'll start our engine, and I'll hold my foot on the brake for at least five seconds. I'll release the break and I'll turn our head lights on now. I'll shut the head lights off. Now, I'll do our turn signals. Okay. Okay. Now, our module should be programmed, so we can run it through the functions and make sure everything is working. All right, we'll start testing using a fore-poll, flat trailer tester. We have these available on our website as part number I26. For this particular application, I would really recommend purchasing one of these. All right, we'll start by turning on the head lights. We'll do a left turn signal. That one is working. Do a right turn signal. That one is working. Step on our brakes. Those are working. Now we'll hold our brake pedal down and do our turn signals individually. As you can see, we have the proper functions for both turn signals while our brakes are applied on our trailer. So, we're ready to hook up to our trailer and hit the road. That completes our look at and installation of the Tekonsha ZCI Circuit Protected Vehicle Wiring Harness with Fore-Poll Flat Trailer Connector and Installation Kit. Part number 119250KIT on our 2015 BMW X5.


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