Check the two multi-plug connectors, one behind the glove box in the CEM, and a second in the driver's footwell near the kick-panel behind the carpet. The latter can suffer from water in the footwell, but both are susceptible to poor contacts on the pins. Breaking and remaking the connections may be enough to "clean" them, but it is a known issue and I understand that Volvo can supply repair kits with upgraded gold plated pins.
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