To check the wiper motor circuit, first ensure the battery is fully charged and in good condition; if the wipers operate slowly, remove the motor and manually operate the wiper arms to check for binding in the linkage and pivots, lubricating or repairing as necessary before reinstalling the motor. If the wipers fail to activate, check the
Fuse, and if it's intact, connect a jumper wire from the motor's ground terminal to ground and retest. If the motor operates, repair the ground connection; if not, check for voltage at the motor with the wiper switch in the HI position. If voltage is present, remove the motor and test it off the vehicle with jumper wires from the battery; if it works, inspect for binding linkage, and if it doesn't, replace it. If there's no voltage to the motor, check the wiper control relays, and if voltage is present there but not at the motor, test the switch. For inoperative interval function, check the wiring continuity between the switch and the wiper control module. If the wipers fail to park, check for voltage at the park feed wire of the motor connector with the ignition on. For wiper motor replacement, open the hood, remove the covers from the wiper arm retaining nuts, and mark the position of each wiper arm before removing them. Then, remove the hood seals and cowl covers, disconnect the electrical connector from the motor, and remove the mounting bolts to detach the motor and linkage assembly. Separate the linkage from the motor, remove the motor mounting bolts, and grease the moving parts before reinstalling. Ensure to align the marks made during removal and verify the motor operates correctly in all modes after installation.