I did a search for this, but didn't come up with anything.

Anyway, my '86-SDL's buzzer is chirping every time I hit my brakes. It's really quick...just a fraction of a second. Any ideas?

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior

Man, I hope this gets resolved.

Mine does the same thing... but get this, IF and ONLY IF the drivers' door is open.

If you stomp the pedal repeatedly, making it chirp, my chirp gradually gets louder and worse until eventually you can get it to do about half-buzzer constantly, from the time you step on the pedal until the time you release it.

The only reason I don't think it's the number one answer to this question, an automatic "Check your grounds" - is that it does that progressive crescendo that starts out with a brief chirp that can't be sustained, and moves on up to a constant buzz that CAN be sustained.... reliably, every time you test it. A bad ground would be an intermittant sort of thing... no ground can gradually become better and worse every time you put it through its paces.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

Remove the console panel underneath the dash and look up there at the ignition lock and see if the wire is seated correctly--in the first case, (or post) its loose, in the second case when it comes on all the time, something funny is going on with your ignition lock ... I know this because I jusy replaced my ignition lock and I have the same problem,, I wll soleve it by next week and let you know

Mine does the same thing sometimes, but only since I did my brake light mod and added 2x the wattage to the system. I've been able to do the repeated activation resulting in a half-tone steady buzzer too.....its probably all due to grounding issues. Lately I haven't really heard it (or noticed it).....so maybe it cured itself.

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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Wasnt the first time I was wrong!