So after seeing the video where someone replaced the stock buzzer in a Volvo 240 with a door chime that plays Africa by Toto, I decided to change my original buzzer out to something more modern.

I did a little research and found Projects Unlimited 12VDC Programmable Buzzer, this is a small flush mount speaker that will loop any 30 second .MP3 or .WAV file that you upload to it. I found it for about $30 on Amazon, but they seem to be sold out now.

I uploaded the door chime from a new Benz onto my programmable buzzer and removed the warning buzzer relay from under the dash and opened it up to take a look.



The buzzer is on the bottom right of the board. What an annoying little noisemaker. To disable it, I removed the little spring holding contact arm on, and pulled the entire arm out of the unit. I know these are easy to find and cheap to buy, but I didn't want to do irreversible damage.



Before disabling the buzzer, I plugged the relay in and used my voltmeter to find where the buzzer got it's 12V source. The ground is on top, power is below it (in this photo).



I drilled a hole in the top of the relay cover and routed the speaker wiring through it, then soldered the power and ground in place.



Then I mounted the programmable buzzer onto the case.



And mounted it in the car. It works!



I do need to make my door chime MP3 louder and re-upload it to the speaker, as it is kind of muffled when it's hidden under the dash. I am happy to be rid of the annoying 1970's buzzer - this modification may not be everyone's cup of tea, but I'm sure I'm not the only one who is tired of the buzz. This was done with my '79 240D, but the process should be similar for most other vehicles of this vintage.

https://youtu.be/2NM1lc7EhEk

Dark video, but you can still hear the new chime.

Max

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Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver)

Instagram: @maximed93