2018/2019 sensing trailer hooked up and wiring
How does stabilitrak and abs systems sense a trailer is hooked up? On '18/19 nox LS without tow package, going to wire in a 7 pin RV connector and brake controller. I am planning on using some isolation relays but don't want to interfere with any stability function when towing. Does the car look for a load on a specific trailer wire? Being a low end trim, no backup sensors to worry about.
Also, I would really like to get a wiring diagram, but helm is not selling manuals until July2019! I hate to guess on wire colors and function. I found the flat 6 pin trailer connector hiding in the bumper, and see the oem hitch harness provides 4 pin connector. I have seen discussed here that the blue wire is for brakes, but what is the remaining wire? My RV has backup lights so was hoping that was the Extra wire. Then just need 30Amps hot lead to charge rv battery and another relay to isolate.