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  #1  
Old 12-14-2010, 07:41 PM
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No W140 brake lights with ig key off?

This seems strange... the brake lights do not function in my '95 S500 with the ignition key off or out of the tumbler. I swear they used to. Am I losing it? Everything else works on the car, save for the flash-to-pass high beams, but I can't imagine that's related... any thoughts?

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  #2  
Old 12-14-2010, 08:17 PM
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The brake lights on my W126 turn off with the key.

-J
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  #3  
Old 12-14-2010, 08:43 PM
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Standard European car, no brake lights with ignition off.
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Old 12-14-2010, 09:58 PM
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Do BMWs do this too? VW/Audi does not, though the horn is on the ignition switch like a Mercedes.

-J
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1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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  #5  
Old 12-14-2010, 11:13 PM
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Thanks guys. Glad to hear it's working as designed, but I'm a little disturbed it took me 7 years of ownership to notice it!

I do think they should light up without the car running, though.

Thanks again!
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  #6  
Old 12-14-2010, 11:28 PM
Craig
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I don't think I've ever seen a car that's brake lights work without the key.
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  #7  
Old 12-14-2010, 11:33 PM
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Quote:
Originally Posted by Craig View Post
I don't think I've ever seen a car that's brake lights work without the key.
I think all American cars have brake lights that work with no key.
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  #8  
Old 12-14-2010, 11:38 PM
Craig
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Quote:
Originally Posted by oestek View Post
I think all American cars have brake lights that work with no key.
Interesting, it's been a while.
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  #9  
Old 12-15-2010, 06:33 AM
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oestek, why would the brake lights need to function without the key in the accessory position or the engine running? Makes no sense to me, and apparently not to Daimler-Benz either.
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  #10  
Old 12-15-2010, 12:09 PM
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Quote:
Originally Posted by Ferdman View Post
oestek, why would the brake lights need to function without the key in the accessory position or the engine running? Makes no sense to me, and apparently not to Daimler-Benz either.
Make that Bosch, as German car electrical systems are to standards set by Bosch.
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  #11  
Old 12-15-2010, 12:41 PM
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I always thought it to be a safety feature. I imagine there would be a circumstance when the car would bot be running and it would be helpful to have visual that the brakes are applied, like during a crash cleanup, towing, etc. We restore American cars and the brake lights have always had hot power with no key function. Not a big deal, just something different in European cars I guess.
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Old 12-15-2010, 08:15 PM
Craig
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It's probably just cheaper to run hot power to the lights than to have them switched.
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  #13  
Old 12-15-2010, 08:30 PM
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As I noted VW/Audi's have the brake lights active all the time.
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  #14  
Old 12-15-2010, 10:44 PM
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Quote:
Originally Posted by oestek View Post
I think all American cars have brake lights that work with no key.
Most Japanese cars also do.

Same with the horn function, actually. For my MB's the key has to be in position 2 (engine running already, or prior to cranking) for the brake lights and the horn to work.
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  #15  
Old 12-16-2010, 02:55 AM
Craig
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Originally Posted by MBeige View Post
Most Japanese cars also do.

Same with the horn function, actually. For my MB's the key has to be in position 2 (engine running already, or prior to cranking) for the brake lights and the horn to work.
Weird, I can't imagine why I would want my horn or brake lights to work with the key off.

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