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I'll need to take another look at how that key-in switch works. I remember from a while back making a close examination of the springs and contacts in the electrical (removable) ignition switch mounted to the back of the key lock. It required uncrimping pot metal, which is sometimes a one-time activity if not destructive the first time.
Also, I have noticed as Roland has, the occasional sticking of that switch, making a key insertion and a wiggle perhaps to un-stick it. That is in the lock, I think, but I can't ever recall which car of ours does that. But I like that switch, especially for providing a place to connect a dash panel voltmeter where I can see battery voltage even during cranking yet not drain the battery. It has no other significant loads, also, so the voltage is much nearer actual battery voltage than is the usual voltmeter connection.
Good to hear you are not expecting a "plug and play" install, because I have no Volvo wiring information indicating it could be. For 84, I am using the poor copy of the foldout wiring diagram found in Robert Bentley. It has notes for European wiring, and where these differences are concerned there is no interpolating possible between my Volvo manuals nearest (81 and 85).
The chime circuit is the chime oscillator and the timers that create the cadence, its decay, and the seat belt warning period, plus the logic to turn it on based on inputs from the key switch (S), lighting (58), the door switch (Su), the key position (15), and the seat belt latch switches (girlfriends 1&2). It also supplies lamp ground for the seat belt warning lights (GF-L) when they are supplied with battery through the key-in voltage.
Very glad you supplied the Volvo part number, so that I can add a truth table for the logic if the map of the innards below is not helpful.
Delighted this post is about making this chime work instead of "how do I find and rip this thing out" we hear most often, probably from folks who never heard the cheap sound of old worn-out buzzers (or owned an old car where it is even possible to leave the lights on). :-)
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Art Benstein near Baltimore
The quickest way to double your money is to fold it in half and put it back in your pocket.
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