Headlight Switch Question...
I've been pondering this for quite some time, I've dug throughout the old postings to find the answer, but to no avail. So, I ask this... Why does our headlight switch have two stages, or stops, when you pull it out? I know that the first stage when you pull it is to turn on the Fog Lights, but what is the second stage for? Anyone???
Thanks for the information! Although it doesn't work on US models it is nonetheless interesting to know the reasoning behind the design. Speaking of German design, how many XF owners actually use the single curb-side parking light feature? I did once, but I had so many people telling me I left my parking lights on I gave up on using it.
It doesn't affect the stop lamp function. On rear fog lamp cars, one reverse lamp becomes the rear fog lamp (so you will only have one reverse lamp). Its on Euro, UK, and Aussie XFs. Placement of the fog lamp (left side or right side) depends on the country the car is sold. The rear fog lamp goes on whichever side is closer to the highway's center median, from what i've learned.
Originally Posted by AMGLover
Second pull will turn the rear driver side stop light on "fog mode" This is an inherited Mercedes feature, the rational being you are driving in fog and people behind you may run up on you at autobahn speeds... so the Germans standardized on the driver side to be the bright warning light - you will also see this on Audi's and BMW's. I actually never have checked to see if the feature "works" on the Xf...
- ej
- ej
Originally Posted by former NXMX5
It doesn't affect the stop lamp function. On rear fog lamp cars, one reverse lamp becomes the rear fog lamp (so you will only have one reverse lamp)
msheredy, you're mistaken somewhere...
The reverse light is a foglight (high intensity) - it is not white.
It is red as per the rules & regs.
The rear tail light housing which has the foglight in it is not the same as a US version.
NXMX5 has it right...
In Europe it's law to have a rear foglight (if my memory serves me correct).
There was a thread on this about 2 weeks ago.
I asked if the wiring was there for the rear foglight, but somebody said that it was not. I initially thought about getting a rear foglight, but that plan was quashed.
The reverse light is a foglight (high intensity) - it is not white.
It is red as per the rules & regs.
The rear tail light housing which has the foglight in it is not the same as a US version.
NXMX5 has it right...
In Europe it's law to have a rear foglight (if my memory serves me correct).
There was a thread on this about 2 weeks ago.
I asked if the wiring was there for the rear foglight, but somebody said that it was not. I initially thought about getting a rear foglight, but that plan was quashed.
Originally Posted by spensley
msheredy, you're mistaken somewhere...
The reverse light is a foglight (high intensity) - it is not white
The reverse light is a foglight (high intensity) - it is not white
Originally Posted by spensley
NXMX5 has it right...
Originally Posted by NXMX5
On rear fog lamp cars, one reverse lamp becomes the rear fog lamp (so you will only have one reverse lamp)
Originally Posted by msheredy
Actually it is the brake light that is illuminated (on US cars), not the reverse light.
Originally Posted by danimal
You aren't even in the ballpark with this one. It does absolutely nothing on US cars. If you will check the gallery of some of our European folks you will see that on the driver's side of the car, the lense will be red where our clear, reverse light is.
Originally Posted by msheredyl
Actually it is the brake light that is illuminated (on US cars), not the reverse light. My girlfriend's C230 does just that. Thinking about it, if it were me coming up on a car and I saw a single white light I would think it was a motorcycle coming at me head on!
for the rear fog lamp, the reverse lamp gets a red lens. check out the pic of my car. i bought the german-spec taillight assembly when i bought my XF because i've always liked rear fog lamps.

do a search for 'rear fog lamp' or 'headlight switch' -- this topic comes up about once a month.
you are partially right about some MBs (the C and the ML come to mind)... they're using the left-side tail lamp as the rear fog lamp housing. but it is NOT the brake lamp. by regulation, the brake lamp has to be a certain distance from the rear fog lamp. check your g/f's car. when she hits the brake, you'll notice there is a distinct brake lamp bulb and rear fog lamp bulb.

do a search for 'rear fog lamp' or 'headlight switch' -- this topic comes up about once a month.
you are partially right about some MBs (the C and the ML come to mind)... they're using the left-side tail lamp as the rear fog lamp housing. but it is NOT the brake lamp. by regulation, the brake lamp has to be a certain distance from the rear fog lamp. check your g/f's car. when she hits the brake, you'll notice there is a distinct brake lamp bulb and rear fog lamp bulb.
Originally Posted by msheredy
I wasn't talking about Crossfires. No where did I ever say that my Crossfire had a rear fog light.
Originally Posted by danimal
Nice save?!?!?! Forgot what forum we were on...LOL.
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