Got it! I found a similar buzzer on eBay that was pictured with 31D labeled 86 and S labeled 85, it was a Rosetta Stone. If I connect S to +12V and 31D & 31 to ground, the chime sounds. 15L - 4 - +12V constant 31D - 86 - 3 - ground switched by driver's door 31 - 2 - ground constant S - 85 - 1 - ...

Thanks, Rick! Maybe mine is busted, there aren't any direct connections between any of the pins, but there's 1K of resistance between 15L and G. When I connect 15L to +12V and 30 or 30D to -12V and then connect an LED between S and G I get a slight crackle from the buzzer - so maybe my module is bus...

Thanks for the diagram! It's strange that the terminals are labeled 31, 85 & 86 with the other three terminals unlabeled. Looks like I'll be doing a little more fiddling!

Yeah, it's a bit of a mystery. Trying up pop this in my 1973 ES as a reversible mod to a less annoying buzzer. Here's what some fiddling has figured out: 15L - positive 12V 31 - 12V ground 3D - 12V ground when 15L and either 31 or 31D are connected, G outputs +12V and S outputs -12V. The output is l...

Ah, I don't have the socket. I'm using it in a project car and trying to update to some newer less annoying-sounding seatbelt chimes.

Hello, I've been searching all over the place and I can't seem to find the following information. I'm looking for an explanation of the pins on a generic Volvo seat belt reminder, part #30884038 It has pins labeled 15l, 31D, 31, L, G and S All the wiring diagrams I've found in Volvo manuals don't la...