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Too broad of a question without some details. Could be:
- short in the wiring / broken wire - usually easy fix
- failed switch - may be repairable also replacement switches used to be available
- wiper motor failure or broken drive mechanism - Out of production. Scandcar offers rebuilt motors and drive mechanism for the P1800 wipers.
http://volvoonderdelen.com/P1800-S/Electrical-system/sort/3a/page/4/
If its just the motor there are specialists on this side of the Atlantic who will rebuild the motor - tends to be a bit spendy.
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