"If you have a spare power stage swap it in and see if it starts."
Before doing this, even if you have a spare module, do the same as Dan suggests about cleaning contacts to the power stage connector. This bore fruit for me in my daughter's 91 240 sedan. Didn't cost a penny.
https://www.brickboard.com/RWD/volvo/1610579/220/240/260/280/update_crank_start.html
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Art Benstein near Baltimore
Back during the days of the former Soviet Union, a fellow by the name of Gerald Chattington had a friend by the name of Rudolph Nosov in the Soviet Embassy, who would drop by occasionally. One evening, Gerald and his wife, Peg, were sitting in the kitchen chatting when Gerald looked out the window and said, "Look, it's snowing." Rudolph looked out and said very quickly, "No, I think it is just rain." "I'm sure it is snow," insisted Gerald. "And I am just as sure that it is rain," said Rudolph. At this point Gerald turned to Peg to settle the argument. Peg looked out the window for a moment, then said, "Rudolph, the Red, knows rain, dear."
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