Well I'm stumped

[Mattcheese31]

Nopes, they were a legal requirement up to '96, just like how all new cars have to have DRL's fitted. It was an idea that was scrapped as sidelights became better quality, all the dim-dip does is bring on the dipped lights with about 1/6th of their normal voltage as a better road position indicator.

ah ok a quick google confirms you are correct, they also fade the headlights up and if it blows render your dipped beam fubar . . .i know coz it's happened to me . .