In my 84 Euro 300D, I'm able to tun on the front fog lights, without turning on the Headlights. Doing so, however, always turns on the running lights. If I pull it out a second time, an orange light comes on, which I assume means "You have a blown / missing bulb somewhere".. since I don't have bulbs installed in my rear foglight sockets. What are those rear foglights used for, anyway? Never found a reason to install bulbs in it.