Hey Wyatt,
My guess is the wiring is bad at the speaker, or its possibly blown. I would check the wiring at the speaker to see if was broken or disconnected. There is a chance the wiring is broken at the door hinge, but that is less likely.
Heres a wiring diagram. It covers everything, including the radio circuits (page 12).
http://pliki.mojevolvo.pl/schematy/volvo_240__1988.pdf
The diagram is from Mitchell and its in English. I highly recommend saving to your computer for future reference.
Regards, Jon 'Uncle Olaf'
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