Originally Posted by X5_Rob

Just for clarification as I just installed the hitch a week ago on my 2005 and did not take to the dealer to program - the trailer lights work (which I would assume would work whether the dealer did the programming or not) and the PDC seems to disable when my trailer is attached (non-brake so can't tell if braking system is functional and hard to tell whether the trailer sway control is functioning or not? What gets activated by the dealer "programming"?