etrailer | Trailer Wiring Harness Installation - 2017 Volkswagen Golf

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Today in our 2017 Volkswagen Golf we'll be having a look at and installing the Curt Powered Tail Light Converter with Four-pole Flat Trailer Connector, part number C59236. Here's what our wiring looks like installed. Now our wiring is designed to be stored inside our vehicle when it's not in use. One of the reasons you're gonna want this converter style that you have to splice in over other options available on the market is many Volkswagen Golf's on the market use poles with modulated wiring in their tail light systems, which are not compatible with many plug-and-play options. Now we'll show you how to get it installed. To begin our install we'll open our rear hatch. Now we'll take out all of our floor coverings. And to make it easier to see, we'll take out our cargo cover here.
Now the center trim piece here, we're going to remove this by pulling up on it. Now we have a torque screw down here in this recessed pocket that we're gonna need to remove. We have another one up here that's in the hinge area for our luggage cover. Now this pocket over here, we'll just grab this and pull it on up. We can grab our interior panel now and start pulling it away.
We don't need to take it all the way off, just enough so we can pull the carpet back behind it. We have two plastic retainers that hold our carpet into place. Use a trim panel tool, and we'll pop these out. With our driver side panels loose we have access to our tail light connector, so we'll repeat the same process on the passenger side. So we need to remove our tail light bulb here partially. In order to do that there's a black tab right here.
We'll press on it and pull back. We won't be able to remove it all the way, but we'll be able to rotate it now to gain access to the lock tab for our connector. So we'll slide this red tab back and press on this black tab here and pull apart. Now that we have our panels apart, you can see I've already made our connections here, but I'm going to explain to you how we came across the wires that we we're gonna use to use our connections. We're only splicing in one wire on each side. The one that we're working with on the driver side is this black and red wire.
This is where we tied in our yellow wire for our left turn signal and left brake light. Now the the reason we're only doing one connection on each side of the vehicle is because this vehicle has what is called a pulse width modulated system. What that basically means is you're not seeing full 12 volts typically. Everything is switched on via low voltage input from our computer, around five volts. I'll explain how this works. I got the positive lead of my multimeter. You're gonna need a quality multimeter for this. I'm gonna go to the back side of my tail light connector and back probing the red and black wire. You back probe something, you don't damage the connector, so you still have good electrical connection. The negative lead of my multimeter, I'm just gonna ground out on our chassis here. Now if we look at my multimeter, you can see I'm registering half a volt. Now this is because I have my headlights turned on right now. So what this is doing is it's bypassing some of the power from the tail light circuit over to our brake light and turn signal circuit giving us a half volt, which isn't enough to turn your lights on, but it is enough to confuse your module that controls your 4-pole flat convertor. So I'm gonna turn my turn signal on now and we'll test for more voltage. Still back probing the red and black wire and with the turn signal on you can see it's going to five volts whenever it flashes. So we know that's our turn signal circuit. Now we'll turn our brake on and test it again. We're reading basically a full 12 volts, which is full power output for the light and that's what we're looking for here. Now we'll repeat the same process for the passenger side to find out which one is our turn signal and our brake light wire. When we did that on the passenger side, we found that that is the purple and black wire. So we made our connection with our green wire here for our turn signal for the passenger side. Now because we only need to have the two connections to our vehicle's wiring and this is a combined multiplex system, our brown wire here, which is typically for our tail light circuit, and our red wire here, which is for our stop light circuit, we combine those with the white wire, which is our ground wire. We use a heat shrink butt connector for all of our connections. We have these available on our website. And our ground wire we grounded behind a 10 mm nut, which is a factory ground point right here. I stuck

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[@etrailer]

We're glad we could help, please let me know if you have any questions. You can check out the wiring harness using the link below:
www.etrailer.com/Custom-Fit-Vehicle-Wiring/CURT/C59236.html