Punto wiper motor stuck on

Fiat punto '52 plate. Hi all. My son came home this afternoon with the cry of Da-ad. The wiper motor was running continuously with the ignition on. I check Haynes and
there are three relays - one in the switch, one in the fusebox and one at the motor. I swapped the fusebox one for another, but it made no difference. I dismantled the wiper switch assembly on the steering column and found a nice little printed circuit board with a relay soldered on. I did not investigate the motor. As a temporary measure I have fitted a switch onto the motor supply wire which isolated the power until I figure out a more permanent solution. Am I right in thinking that the fault is caused by a sticking relay?
Any help would be appreciated. Thanks Davy M.
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