This has probably been asked several times, but new to rv forums. I have a 2018 canyon 4x4 and finally got it set up to flat tow. i have read that you are supposed to be able to turn selector knob all the way clockwise, hold 15-30 seconds and red "n" is supposed to appear. Mine won' do that. It does have a "n" that appears for a second when you first turn on vehicle. I have tried with vehicle off, on, neutral, and park. Am i doing it wrong or do i have an issue with vehicle?