..simple first
Presume you've checked the blindingly obvious already, ie the fuses as one may have blown. Otherwise I fear that the motor may be kaput. On an early car it's in an assembly with the rack and wiper spindles behind the dash and awkward but not impossible to get at.
A useful piece of information for us would be whether the wipers themselves are now stuck in place or moving freely. If the latter then something in the rack is broken (not that I know of this ever happening). Otherwise it's the motor not turning.
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Mark
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