Brake Lights Wont Go Off! - Mercedes-Benz Forum
 
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#1 (permalink) Old 05-23-2007, 05:54 PM
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Brake Lights Wont Go Off!

My brake lights are constantly on. Im guessing theres a switch or solenoid that went bad or is stuck. I searched near the pedal and found no such switch/solenoid. Anybody know where the switch is located???

thanks!
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#2 (permalink) Old 05-24-2007, 01:37 AM
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some of the newer MB dont use brake light switches. its a possibility you have a faulty rear sam as that controls the brake lights.
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#3 (permalink) Old 05-24-2007, 07:23 AM
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Quote:
Originally Posted by Streetglower
some of the newer MB dont use brake light switches. its a possibility you have a faulty rear sam as that controls the brake lights.

whats a rear sam? where is it located?

thanks!
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#4 (permalink) Old 05-24-2007, 08:00 AM
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At this point I would simply return to the dealer and have it fixed under warranty. Maybe a fuse could cause it. Auto electric circuits can have all kinds of loops. Make sure everything is working.
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#5 (permalink) Old 05-24-2007, 06:41 PM
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I had a similar problem on a fairly new vehicle (not a Benz) many years ago... it was a stuck relay. I unplugged it from the fuse block and reinserted it. The problem went away never to return. I don't know if the ML uses relays for the brake lights, but it's worth checking.
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#6 (permalink) Old 05-30-2007, 03:53 PM
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If the lights are indeed controlled by the SAM, then ther would still have to be a switch of some type to tell the SAM that the pedal was pressed.
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#7 (permalink) Old 05-30-2007, 05:20 PM
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Quote:
Originally Posted by VJ1979
whats a rear sam? where is it located?

thanks!
rear sam is the signal and aquisition module, it basically controls certains components. brake lights, fuel gauge, central locking, etc...
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#8 (permalink) Old 05-31-2007, 05:04 PM
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Oh, for sure. But something still has to tell the SAM that the pedal was pressed.
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#9 (permalink) Old 06-01-2007, 01:57 AM
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if I remember correctly, one of the BAS sensors detects the pressure on the pedal and in turn sends signals to the rear sam which in turn activates the brake lights. i would have too look it up though
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