Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
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Quoted: 15 Post(s)
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.)
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)