90% of the time it is the circuit board behind outside cover of wiper motor. wiper motor is located on firewall on drivers side of engine compartment just below windshield cowl on vertical part of firewall just inboard from power brake booster. 3 or 4 small bolts hold cover on and simply unplug and replace. best test if it is circuit board is to see if wiper motor starts by tapping same outside cover lightly. it is a PITA for most DIY’ers.
good luck
see the diagram in #18...from autozone