I have an 2003 LX470, which has the factory 7-pin trailer light adapter. I extended these lines when I installed the frame mounted hitch. I also installed a P3 brake controller into the factory harness. When I hook up my trailer, everything works perfectly, (lights, brakes, etc). However, when I turn the car off (key out of the ignition) I notice that my rear windshield wiper is running on intermittent, my heater fan motor is running on low, and I can't lock/unlock the car with my FOB. Once I disconnect the trailer lights, all is well, and sometimes if I open the rear hatch it all stops. The problem is repeatable. I don't even how to start troubleshooting this issue. Anyone else ever had this problem?