I've a door ajar buzzer sound when I hit brakes with signal direction on? OK, every time I touch the brakes I hear a faint buzzer sound for a short moment. While I have the brakes on with the signal (left or right) I have a faint buzzer sound comming frome the dash every time the blinker lights? Oh yeah, the seatbelt light flashes as well...What is going on???
JD

Are your battery connections clean and tight? Sometimes loose/corroded cables will cause an array of strange electrical problems on any car. Just a thought.

100% normal!

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Just got another w126 350sd and it’s doing this. Seatbelt warning light stays on with it buckled, and pressing the brakes makes the buzzer come on.

Has anyone else encountered this?

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

Had a buzz sound on brake application on a W124, it was a dirty fuse connection. I don't recall which fuse but cleaning it worked.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

Good point, they all look pretty oxidized.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

Replace them all with proper copper fuses.

__________________
1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

“Proper”? I think these were OE.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

oe was copper, aluminum is cheap aftermarket.

For whatever reason copper white fuses are hard to find. Aluminium fuses are cheap junk, not OEM.

https://www.pelicanparts.com/More_Info/114825.htm?pn=114825-INT

https://www.pelicanparts.com/More_Info/114816.htm?pn=114816-INT

__________________
1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).