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Trailer Wiring Harness Installation - 2010 BMW 5 Series

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How to Install a Trailer Wiring Harness on a 2010 BMW 5 Series


Speaker 1: Today on our 2010 BMW 5 Series Wagon we're gonna be taking a look at and installing the Tekonsha ZCI Circuit-Protected Vehicle Wiring Harness, part number 119250KIT.So, here's what our wiring's gonna look like when it's fully installed. It is gonna stay inside the vehicle at all times, and when we're ready to tow, we can just drop it down the hatch, close the hatch and it'll be right here whenever we're ready to hook up our trailer. Now, it's gonna give us a four-pole flat for our trailer, which is gonna have all the required lights when we're driving down the road, such as our taillights, turn signals, and brakes.Now, what's great about this wiring is is we're not gonna have to cut in or even plug into our factory wiring. Our connectors are gonna wrap around our wire, and there's a sensor inside that's gonna detect the current. So we're not gonna overload, or even put any kind of draw onto our factory wiring. Now, it is gonna come with a circuit-protected power module, and that's gonna ensure that any feedback from the trailer that might happen won't come back into our vehicle.

Now it's also gonna take the current and the signal from our vehicle and convert it into a usable signal for the lights on our trailer. Now that we've gone over some of the features, let's show you how we get it installed.To begin our installation we're gonna need to get into our rear hatch, and we're gonna need to open up the rear panel right here. Now, we're gonna have two support rods attached to a couple cables. Now if we come to the front section where it's attached to the panel up here, we'll notice that it's in a slot. I'm gonna grab the cable, take some of the tension off, and then we're gonna slide it out of the slot on both sides.

Now if we come to our support rod here, we got to the top, there's gonna be a collar. If we grab that collar and pull down, we're able to separate it from the board. Now, on the front and the back of our panel on each side, we're gonna have a 10 millimeter bolt. I'm gonna be using a 10 millimeter socket to take those out. And we're gonna remove the other two on the passenger side as well.Now, at the back of our support rod if we look at the base, we're gonna have a small notch there.

Let me take a flathead screwdriver, we can pop that section up. And we're actually gonna rotate the support arm towards the rear of our car, and we can pop it out. Then we can lift up on the panel and pop it loose. Then we're gonna need to fold down our cover and move to the front side. Now here's gonna be the front side of that piece that we just popped up.

So again, if we take a flathead screwdriver, we can pop that section up and unlock it, then we'll be able to remove it from the back side.Before we move to the front, we're gonna flip these covers up here, one on each side, and we're gonna notice that there's a bar that's inside of a channel right here. Now we're gonna slightly lift our cover up, and we'll be able to pop it out of that channel. Again, notice our channel here, and it's facing down, so if we can fold our cover back, and apply rearward pressure, it'll pop out of that channel. Now, you may need to take a flathead screwdriver and pry up on that tab just a little bit to get some room, and a little bit of pressure taking it off. Now we can put our panel aside for now, and continue taking apart the interior.Now, at the very front of our panel, towards the front of the vehicle, we're gonna have two pushpin fasteners. And I'm just gonna take a flathead screwdriver and pop them out. Now you want to pop out the center section which will relieve some tension and release the base. Now we're gonna do the same thing for the other fastener. Now with all that out of the way, we can go ahead and pull our bottom cover out, and we're gonna set this aside as well.Now we're gonna need to come to the passenger's side where we have our first aid kit. We're gonna lift the lever, pull the panel out, and set it aside for right now. After we have that panel out of the way, we have removed the bolts holding this bottom section in place, so we can simply lift up and remove the panel and set it aside so we can gain access to the battery. Now we can come to the driver's side and we're gonna remove this panel as well. But we're not gonna have to remove the floor covering. We just need to get access to our taillight wiring.If we come to the back section of our headlight here, we're gonna find a black plug that's gonna be attached to our headlight housing here. That's gonna be our taillight circuits. Now, if we pull the whole tab towards the back of the vehicle, it'll release it off of the clip that's holding it in place. And we can slide it out. Now that we have it out, we're gonna go ahead and disconnect it. If we push on this tab right here, it'll separate the two connectors. Now with an extra set of hands, we're gonna have them turn on the headlights, that way we can start testing to figure out which one is our headlight circuit.Now, I'm gonna take the provided circuit tester in our kit, and I'm gonna find a good ground point. And this screw, bolt, right here would be just fine. Now, I'm gonna go through and check each one of these connection points here to see which one is my taillight circuit. And once the light comes on and it stays on, we'll know that's the right circuit. So we can tell that this end pin here that corresponds with the black and red wire, is gonna be our taillight circuit.Now, I do want to mention, you want to go ahead and write that down, or remember it, that the red and black wire is our taillight wire. And now with the left turn signal on, we're gonna find out which one of our wires is our turn signal. Now it should be blinking, and it may be blinking faster than normal because our connector isn't plugged in. Looks like this wire right here, this connection point, which corresponds with the blue wire that has the brown stripe and yellow dots, is gonna be our left turn signal.Now that we have those figured out, we're gonna need to find our brake signal wire. Now this is gonna be on, staying on the whole time. And we know that the wire on the end here is our taillight. So we're looking for any other wire connection point that's gonna light it up. Looks like it's gonna be the yellow wire here on the end with the red stripe. And we're gonna need to write that down as well. Now we're gonna move over to the passenger's side and start checking for our signals there. Now again, I'm just gonna use another mounting screw or bolt as my ground. And I'm gonna disconnect my wiring harness. And it looks like the blue wire with the brown stripe is gonna be my right turn signal.Now coming back to the driver's side, I'm gonna take my harness and I'm gonna start out with my turn signal. Now, each one of these are labeled. The way we we're gonna attach it to our wires to connect everything is we come to this tab right here. We lift slightly, it'll unhook and we'll be able to open it up, exposing the two magnets and the material inside. Now, if you'll notice there's a small channel in between the two magnets as well as on the backside. Now we're gonna take our left turn signal wire, which is gonna be our blue and brown wire with the yellow dots, and we're gonna lay the wire in that channel. Once we get it in there, we're gonna move the other wires out of the way, so that we can close it around the wire.Now that we have it secured into place, we're gonna take some of the provided foam tape and we're gonna wrap it around the wire and our connector here. That way it doesn't move around. So we're gonna remove the backing off of our foam. We're gonna make sure the wire's sitting where we need it to in the channel. I'm just gonna take the foam, and I'm gonna wrap it around my connector and the wire, making sure that it's gonna keep everything nice and secure.With that connection made, we can come to our taillight connector. And if you remember, I have it written down, it's gonna be the red and the black wire here on the driver's side. Now, again, I just want to mention that if we look at the cover we're gonna want to make sure that that arrow is pointing towards the end of our connector and towards the light. Now we can take our wire. We're gonna do the same thing we did with our turn signal wire. We're gonna put it into the channel in between the magnets and then click it into place. Now we can put our foam tape around it to keep it secure.Now finally, we can find our stop light circuit. That's gonna be the yellow and red wire if you remember. Now here on the passenger's side, I'm gonna slide some of this tape away from my wire so I can get a little better access. And we're gonna take our blue and brown wire, that's our turn signal wire, and then we can put our foam tape around it to secure it. Now with all of our connections made, we can go ahead and plug our taillight plugs back into the lights.Now we are gonna need to ground our converter box. So I'm gonna go ahead and remove my spare tire, that way I have some access to some bare metal. I'm gonna take the provided self-tapping screw, and I'm gonna drill right into this bare metal here my grounding point. Now to test our converter box, we're gonna have a black wire. That's gonna be the wire that we're gonna have to run to our battery. I'm gonna take the provided heat-shrink butt connector, and I'm gonna place it on one end of the wire. Then I'm gonna crimp it into place. Now on the other end of my butt connector, I'm gonna take the provided black wire that comes in our kit, and I'm gonna strip back one end and connect it there.Now I'm gonna be using a heat gun to shrink down my connector, and I just want to mention if you're using an open flame such as a lighter or a torch, you want to be careful not to char the connector or wire itself.Since our battery is located right here on our passenger's side, we're gonna have plenty of wire. So I'm just gonna route my wire along the back of my vehicle and get a rough idea of how much wire I need. Then I can cut it, making sure that I have a little bit of extra. Right about here's gonna be good. So I can go ahead and cut my wire. Now I'm gonna strip back the end of that wire. Now I'm gonna take another one of my heat-shrink butt connectors and connect it to the end. Now on the other end of my heat-shrink butt connector, I'm gonna take my fuse holder that's provided in our kit and I'm gonna crimp it in place. Now on the other end of my fuse holder, I'm gonna take the provided ring terminal and attach it.Here at our battery, we're gonna have a few different connection points that we can choose from. We have one that's gonna be accessible right here, as well as one right behind the cable right here. Now, I'm gonna be using this one because there's no cable directly attached to it, and that way it won't lose power to my vehicle's computer and have any other issues arise. So I'm gonna be using a 10 millimeter socket to remove the nut on top. Then I can put my fuse holder in place. So we're gonna put our ring terminal in place. Then we can reinstall the nut and washer that we removed.Now I'm gonna take the provided 15 amp fuse and I'm gonna put it in the fuse holder. Now we can begin to test our lights. I'm gonna take my four-pole wire and I'm gonna drop it down out the back of my hatch because we are gonna have to learn the system. Now, what I mean by that is we're gonna have to run the functions of our lights and our converter box is gonna have to realize which signal is which. So, I'm gonna plug in my tester here. If you don't have a four-pole tester, you can pick one up on our website using part number I26.Now we're gonna want to make sure that our key is off, all the lights are off, and we're gonna let our vehicle sit just for a few minutes to make sure everything is off.Now when we begin to learn our system, we're gonna need to start the car, or at least have the accessories running. And we're only gonna want to do one function at a time. So we're gonna turn on our headlights for right about five seconds. And after that elapses, we're gonna turn them completely off. Now we can go ahead and push on our brake, for right about five seconds. Once that time has elapsed, we're gonna completely let go of the brake, and we're gonna put our left turn signal on. For right about five seconds. Then we can turn it off. Now turn our right turn signal on. Now the system should realize each signal separately.Now we can go back to the back of the vehicle and make sure everything's working properly. Here we have our taillights. Here we have our brakes. Left turn signal, right turn signal, and then finally our brakes with our turn signals. Looks like everything's working properly, just need to tidy up some wires.Now that we know our lights are working, we're gonna need to find a spot to mount our converter box. And I think right here we'll have just enough room to mount it where it won't interfere with our spare tire, but it'll still be tucked out of the way. So we're gonna take the provided double-sided foam tape. We're gonna take the backing off of one side. We can put it on to the back of our converter box. I'm gonna push pretty good to make sure that it adheres to it. Then we can take the other backing plate off. Place it in the spot we want to mount it, and push firmly.Now my wires on my driver's side I just took them, and I bundled them together, and zip tied to to more factory wires here. Then, since most of my wire is on the driver's side, I lifted this panel up slightly, zip tied all of them together in a nice little bundle, and then just tucked them underneath this panel. And the ones going to the passenger side I ran across the threshold, tying it to some more factory wires there. So now that everything's clean, I just need to start putting my panels back in place.And that'll finish up our look at the Tekonsha ZCI Circuit-Protected Vehicle Wiring Harness, part number 119250KIT on our 2010 BMW 5 Series Wagon.


Info for this part was:

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