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On my last two BMWs (US), the rear fog lamps were actually already installed in the panel (a GT and an i3). On the GT, just changing the switch made them work. On the i3, while I never bought the switch, what I have heard from others that did, it required a software coding to enable them.
If you look at the switch assembly itself, none of the switches in there are actually running power to anything...the small wires power a small circuit board, backlighting, and a serial CANBUS signal comes out of the switch board that then tells a module back near the rear to turn the lamps on. On the GT, there were only three wires, power, ground, and a signal line that controlled all of the lights back there. Not sure on the X5 how that has evolved. On both the GT and the i3, rear fog lights came on both sides symmetrically. that might be able to be changed with software.
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