jogger

I saw a guy with them on at the same time, mine does not. any ideas?

laneshift

It's not you. Normally- highbeams on= fogs off. The guy you saw probably did some exclusive wiring.

Norwichdelta06

is DOT stand that when the highbeams are on the fog lamps turn off.

LawRens

Dunno if OP was talking about another w203, but my w202 can have all lights on. Fogs, lows AND highs, without aftermarket wiring.

LILBENZ230

I'm sure he was talking W203 since this is the 203 forum and his "drives: 2007.." car.

Mine shut off with the highs. Normal. I'm sure you can wire it to change it, but the fogs are more for decoration. Mine are properly aimed and are hardly noticeable. Maybe it's my 55w HIDs overpowering them..

1fast68

If you can find your light circut just add a diode between your Highbeam wire and your fog light wire. just put the diode in so that the current flows from the Highbeam to your fog lights. Should be located under the dash somewhere. I done this mod on my Z71, but also added a diode so my Lowbeams stayed on with the Highs.

drexappeal

OEM standard is that fog lights turn off when you put on high beams. There are only 2 exceptions that I can think of:

1) What you saw was the passive cornerning lighting (where the foglight that is on the side you are turning towards lights up)

or

2) The primary foglights are wired differently (Like mine, where I have a quad fog setup and my primary foglights turn on with in Auto setting, when the headlights go on...which allows me to put on my brights and still have the foglights on).

If we're strictly talking about OEM, I can't remember a car that ever had the capability of having high beams on without the foglights turning off, per regulations.

jogger

thanks. i was guessing it is a mod since the car had wheels and a few more mods.

timmynabenz

mine has the xenons from factory and i can have the high beams on at the same time as the foglights if i put the light switch on the selction just to the right of AUTO. the one that just turns on your city lights.

acr2001

That's an interesting observation. I guess that's because legally without the low beams on you can have the fogs and highs on. Seems that they put quite a bit of thought into this.

drexappeal

Interesting. I never thought of trying that. Thing is, that would still legally constitute only 2 sets of lights on (high beams and foglights) at one time, w/ 1 set of parking lights.

When you turn on the high beams (while the primary headlights are on), technically speaking there are 2 sets of lights on (high beams and low beams w/ 1 set of parking lights), which is why the foglights automatically turn off.