That relay, 2/30, controls power to the radio and heater low speeds. It is probably located with the fuses under the hood near the windshield. The problem could be the ground for that relay at 31/50. You will have to get a relay layout to learn which one it is. Seems like there should be something on one of the Volvo repair sites. Try Bay 13. Does anyone have a "Volvo" Electrical service manual?
This will be in interesting one. Please let us know what you find.
Good luck
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Tom 69-1800S, 72-1800ES, 96-850T
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