Hi,

I hope I am not going to confuse you more than you already have. On my 1991 940GLE, the rear fog light cannot be switched on unless my headlight (not the high beam)is switched on first. It doesn't even operate with the driving lights at the fenders (I think this small lights are called day time running light). If my headlights are not switched on or even if I only switch on the small light, no matter what position is the fog light switch, the fog lights (front and rear) will NEVER come on. I said no matter what position because the first click on the bottom of the fog light switch operate the front fog lights and another click at the same spot operates the rear fog light. There is only one rear fog light on my car. The other side is non-use eventhough there is a socket because there is no hole on the body of the rear lights to insert the bulb.

Whilst the rear fog light can be switched on with the headlights on, the front fog light only comes on with the high beam lights on (provided the fog light switch is already depressed once). If no high beam, no front fog lights.

But I noticed that the later model, the fog light switch can be operated with the small lights on and not the headlights i.e. the fog lights (front and rear) can be used as long as the small lights are on. But the switch operates in the same sequance i.e the first press turns on the front fog lights and the second press turns on the rear fog lights.

Hope this will be some guide for you.

velan

Kuala Lumpur, Malaysia