b1g1an
MB Enthusiast
Assuming they're like every other car in the universe, they wash when they're on and you wash the windscreen BUT it's not every time and I believe Mercedes idea of once every... is far less often than most.
That's not meant to sound facetious in case it does, just that's how all the headlight washers on other cars I've had worked.
That's not meant to sound facetious in case it does, just that's how all the headlight washers on other cars I've had worked.
Every 5th time you wash the screen IIRC
Merc Owner 2B
MB Enthusiast
Hmm, I've never seen it happen and the headlights are always dirty.
On my old car it used to be that after a continuous press of the stalk, roughly 8 seconds it will activate the headlight one.
I'll ask someone to press it 5 times and stand outside and watch.
On my old car it used to be that after a continuous press of the stalk, roughly 8 seconds it will activate the headlight one.
I'll ask someone to press it 5 times and stand outside and watch.
- Joined
- Jun 18, 2010
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- 3,203
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- Sussex and Tuscany
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- 2003 W209 CLK, 2005 R171 SLK, Volvo XC40 P8 Twin Motor Pro EV
Both our CLK and SLK have a separate switch near the headlight switch. Have to say I have never used them so dont even know if they work.
grumpyoldgit
MB Enthusiast
Once every 'x' number of times seems a bit of a design flaw to my mind. What happens if you need to clean the lights urgently. Can it be changed though Star?
- Joined
- Nov 6, 2007
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- 13,628
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- North Oxfordshire
- Car
- His - Denim Blue A220 AMG Line Premium / Hers - Obsidian Black R172 SLK55
I can't say I've ever encountered a situation when I've felt I needed to clean the the lights urgently, but if I ever do I'll stop the car, get out, and give them a wipe.grumpyoldgit said:
Unfortunately the "blast" type headlamp wash systems use large quantities of water, so if they worked every time you washed the screen you'd spend much more time looking for a tap.
b1g1an
MB Enthusiast
Personally, never been overly convinced by them as they dont shift the layer that the bulbs have burnt on but they would shift a load of crap that's literally just been sprayed on the light from a passing tractor or something.
The old style ones with actual wipers were much better but obviously have issues of their own.
The old style ones with actual wipers were much better but obviously have issues of their own.
I thought that they get washed the first time you use the screenwash and then every 3rd time after that. I still clean the headlamps manually at least once a week as you get to notice, especially on country lanes, a gradual deterioration in visibility
Unless your axle deep in muddy water I cant imagine your heads getting that dirty?
- Joined
- Nov 27, 2004
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- 4,800
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- Southampton
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- 65 Plate E350 CDI Convertible, 2006 CLS 55 AMG, 1997 C230K, 1999 C43/55 AMG
On the 202 C class, it washes and wipes the headlights everytime the screen is washed whilst the headlights/dipped beam are on.
rf065
MB Enthusiast
- Joined
- Jun 8, 2007
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- 5,346
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- Grossbritannien
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- SLC300 - C250d Estate 4 Matic & Z900rs
richywiseman
Member
- Joined
- May 16, 2012
- Messages
- 43
- Car
- E63 AMG, Previously C63 Coupe
Every 5th time on C Coupe 
Dieselman
Banned
- Joined
- Jul 13, 2003
- Messages
- 34,199
- Car
- Peugeot 403 Convertible
