I can't work out whether I'm being trolled here or not....
I'll have one last stab at this. I have never suggested that the function only works when the trailer is connected. Here is the post where I set out what I was told:
Quote:
That half meshes with what the dealership told me - Trailer Stability operates all the time (basically it is just the ESC function) but when it detects a trailer is attached it moves up a notch - it applies the brakes in a different fashion.
Also, they explained to me, that some other related functions are dependent on the trailer being detected - for example, the Disco won't raise or lower the suspension if travelling at speed with a trailer connected.

