It sounds simple, but if you heard the language coming out of my wife's car at that point, you may have a different take on it. Once done, took the tape off, and worked a while getting that foam tape stuff they send with the kit around the wire and sensor while not wrapping the other wires from the tight little bundle in there with them. I went full high-tech during the install, using Scotch tape to hold the sensor and wire together until I found the combination I needed. The sensors are kind of big when you're trying to get them in the middle of tightly packed wire bundles, so plan to cut back on the tape or whatever is holding the wires together a little more than you think you need. You don't need them if you have patience and a trailer right next to your car in the garage. Doesn't come with a trailer light tester or voltage sensor, both of which would be useful. It took me under 2 hours to finish once I got the panels off, and it works GREAT! Once I found out that only the multi-colored wires mattered, it was simple. Turns out on the right (passenger) side, the blue and green was turn signal. The others were solid colors.Īfter temporarily hooking up the sensors, I ran through the completely simple programming, attached the trailer and voila! Let's give that bad boy a shot! There was also a green and blue wire in the bundle. But there WAS a purple wire with white stripe on both the driver and passenger sides. The video said the turn signals were on a white with purple striped wire on the 2017, of course there was none of that in the 2021 model. I decided to start with what worked on the 2017 model that was in the etrailer video, meaning I was only going to hook up 3 of the 4 sensors, leaving out the Brake sensor which would imply (according to their instructions) that this was a 2-wire system (with 4 wires going to each light.so it makes total sense.) □ Is it a 2-wire, 3-wire, BT (brake/tail light multiplex), or a BTT (brake/tail/turn multiplex) system? On the BMW it has 4 wires going to the tail light assembly, so not a lot of clues there! And it's not exactly clear in the newer models. I think the hardest part is determining what setup your car is. What you need to know first, is that this does work! Take your time, you'll get it. Well that's a wee bit troubling, right? I sent Tekonsha an email, got a response 2 hours later saying, yup, the 119251 is for you! Woohoo! So thanks for the GREAT info, etrailer and Tekonsha, but I bought the kit from Amazon where it was WAY cheaper, used the etrailer video to get me started, and went to the garage to rip out the innards of the back end of my wife's car. Went to the Tekonsha site just to compare prices, did the same exercise, and it came back with nope, there isn't anything that will work on your car. And on their site, you put in your specific car and it tells you which harness/hitch/killer cassette stereo, whatever will work on your car. I looked far and wide to find a wiring system that would work with a non-trailer-ready BMW (U-Haul said there was nothing out there - Ha!) I found more info than what was on Amazon on etrailer, and they had a decent video that really helped. My wife just wants "to push the button and the thing works" with tech stuff, so you're stuck with me. Husband writing this review, not that it matters.
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