BAS/ASR Light - Brake Light Switch - Are There Any Physical Signs of Malfunction? - Mercedes-Benz Forum

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Old 03-25-2011, 01:37 PM   #1 (permalink)
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Post BAS/ASR Light - Brake Light Switch - Are There Any Physical Signs of Malfunction?

Hello everyone,

My brother owns a 1999 C230 Kompressor which recently has been afflicted with a constantly illuminating BAS/ASR warning light.

From my reading of the Forum, one of the solutions is to replace the brake light switch.

The thing is, today our independent mechanic removed the brake light switch and it LOOKED fine; the plunger was not stiff and seemed to press in and out without restriction.

The question is WHAT are visible signs of a faulty brake light switch?

Is it:

a) the plunger being stiff/restricted in movement?

or

b) UNSEEN electrical problems from WITHIN the switch?

Please advise.
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Old 03-25-2011, 01:48 PM   #2 (permalink)
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One side effect of a faulty brake light switch is that the cruise control will no longer work. If cruise was working, it may not be the switch. could be one of the wheel sensors
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Old 03-25-2011, 02:12 PM   #3 (permalink)
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Thanks for your reply; we did not test whether the cruise control works.

The question is WHAT are visible signs of a faulty brake light switch?
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Old 03-25-2011, 04:18 PM   #4 (permalink)
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I don't know if there are any visual cues that are definitive. Remember that the BLS does more than simply illuminate the stop lamps -- as on most cars. In the MB the data from it is fed to the systems so if the data is faulty, bingo, failure. Dirty contact surface inside isn't seen or felt, but will feed bad data.

For what he paid the mechanic to remove it and look at it why not just swap the stupid thing? It's like a $25 part at the stealer (which is the recommended place to get it, the aftermarket ones tend to be unreliable).

If you read through A1EK's thread in the W210 forum, you'll see that he chased the issue for a while with mechanics and diagnostics; I'd hate to think what that cost. Thus, my knee-jerk reaction is to just suggest to people they first change it, then move on. (FWIW, I carry a spare in my trunk, easy enough to do when parts are small and cheap, ha ha.)

Good luck!
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Old 03-25-2011, 09:45 PM   #5 (permalink)
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you will only be guessing without proper codes, altho a brake lamp switch is very likely. but still a guess. you could just replace it for 25 bucks and if it doesnt fix the light then then go to the dealer for a proper diagnosis, (im surprised the indy mechanic didnt have the proper SDS mechine to give you a code). BTW a faulty brake lamp switch will almost never look any different from a new one, other than the yellow old plastic color, unless its smashed. it will become internally defective.
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Old 03-25-2011, 09:49 PM   #6 (permalink)
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also if the light comes on ONLY after you press the brake for the FIRST time after starting the engine then its prob the brake light switch..
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Old 03-26-2011, 01:47 AM   #7 (permalink)
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Smile

Fantastically rational answer as always Greg; MANY THANKS - I have a new one on order.

Dealermastermechanic, thanks for your input too; consider yourself lucky to live in the US - I'm out here in West Africa - SDS and other gadgets like that are not a given.
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Old 05-09-2011, 10:54 PM   #8 (permalink)
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Is this located near the emergency brake?
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Old 05-10-2011, 05:20 AM   #9 (permalink)
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My brake light switch would get stuck in the closed position. After depressing the brake pedal, all I had to do is wiggle the switch stalk a little and it would release. It is a good bet to keep a spare switch in the trunk. I'm working on my third one. Also important to mention is that the brake light switch, if broken, will prevent the tranny from shifting out of park. This switch works on two circuits, one for the brake light and one for the tranny lockout. This prevents you from shifting out of park unless your foot is on the brake pedal.
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Old 05-10-2011, 06:48 AM   #10 (permalink)
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I replaced mine about two years ago and examined the inside of the old switch. The contact points seemed to have just worn themselves out and did not look to be renewable. It is a very high use item that is made of plastic and a bit of metal.
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