I doubt that DLRs are fitted to the ARP4, mine doesn't have this wiring configuration, nor have I heard about it on any others, although I suppose it is possible. I suspect it was an error when laying in or connecting the wiring loom. As it happens, I do normally drive with the sidelights on, as on the LED lights fitted to the ARP4, the side light is in the centre of the light unit, though only seems to use one LED, so not sure quite how much use it is.
Best thing is to take the car to a dealer and claim under a goodwill warranty or even sale of goods act as it is plainly wrong.
