My son had the same issue with his s60 2010 model . Always went off at night when temp dropped. Fitted a replacement and all sorted.
Opened up old unit all looked well with no corrosion and battery seemed to check out. Think fault developed in circuitry probably age related( built in redundancy ?)
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The secret of flight is to aim at the ground and miss !
Previous Volvos 740 GLE . V40 CD ,V70 2.4 SE LPT.V70 D5 P2. V70 D5 Se Lux P3. Current Jaguar XF Sportbrake but still like Volvos
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