Make sure the battery works well before testing wiper function, but you need to inspect the motor linkages and pivots first. If the wipers run slowly, remove the motor, move the arms by hand, look for bent connectors and mounting points, lubricate them if needed. Before fixing, check if the fuse is working. Then, join a jumper wire between the wiper motor's ground terminal and ground - if the motor starts working, fix your ground connection. When the motor gets power, take it out, connect it to the battery by jumpers, and see if it works. If it runs fine, look for stuck linkage that binds; if it fails, install a new motor. Inspection must start with the motor's control relays - if they get voltage, remove power supply from the motor. Then test the door's switch. To check if the interval operation works, look for continuous wire connection between the switch and wiper control unit. While holding the ignition on but the switch off, check if you read voltage on the park feed wire. Begin by removing power from the battery, writing down where your wiper arms stand, then disconnect them. Next, take off the weather shield covering your windshield. Open the wiper motor harness connector, remove the mounting nuts, and pull the wiper motor assembly from its position on the cowl region, splitting the motor from the rest. You put the wiper arm together by pulling out the locking tab completely before connecting it. To take out and reinstall the rear wiper motor, first take off the trim board from the back door, record where the wiper blade lies, disconnect the wiring connection, loosen the mounting bolts, and raise the motor assembly up from the hatch area. Installation works the same way in reverse.
