The fuse thing can work, and did for me for a while, then one day stopped working.
The problem can also be because of the On Call backup battery has gone flat, or because the microphone has broken, or in my case because the Volvo OnCall subscription ran out. I think the latter is the real reason for most people's issues.
I had a gripe with the main dealer and after a curt letter they agreed to pay for a years worth of Volvo OnCall and miraculously the problem went away!
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