This is also the chime for key in ignition.
It's behind the left side of the dash. If it's the type I'm familiar with, it's got a rotating thingamabob inside that strikes two metal plates and should be able to be unplugged. My best advice to see if you can get to it without disassembling anything is to open the door with the key in the ignition and start feeling around in the vicinity of the noise. You should muffle the noise if you grab it.