Check the wiring diagrams for wire colors and locations during the following checks. Power wires are generally larger in diameter and brighter colors, while ground wires are usually smaller and darker. To check for voltage, use a grounded 12-volt test light on each terminal at a connector until it lights, confirming voltage at the terminal. If the wipers work slowly, ensure the battery is in good condition with a strong charge. If the battery is fine, remove the wiper motor and operate the wiper arms by hand, checking for binding linkage and pivots, lubricating or repairing as necessary before reinstalling the motor. If the wipers still operate slowly, inspect for loose or corroded connections, particularly the ground connection, and replace the motor if all connections appear fine. If the wipers fail to operate, check the fuse; if it's okay, connect a jumper wire between the wiper motor and ground, then retest. If the motor works, repair the ground connection; if not, check for voltage at the motor and test it off the vehicle with fused jumper wires from the battery. If the motor works off the vehicle, check for binding linkage; if it doesn't work, replace it. If there's no voltage at the motor, check the switch for voltage and the wiring between the switch and fuse panel for continuity, replacing the switch if the wiring is fine. For wipers that only work on one speed, check the continuity of the wires between the switch and motor, replacing the switch if the wires are okay. If the interval function is inoperative, check the wiring between the switch and motor, replacing the interval module if the wiring is fine. For wipers that stop in their current position when the switch is turned off, check for voltage at the motor with the switch off and ignition on; if voltage is present, the limit switch in the motor is malfunctioning, requiring motor replacement. If no voltage is present, trace and repair the limit switch wiring. If the wipers won't shut off unless the ignition is off, disconnect the wiring from the wiper control switch; if the wipers stop, replace the switch, but if they keep running, replace the motor due to a defective limit switch. For wipers that won't retract below the hoodline, check for mechanical obstructions in the linkage or vehicle body, and if none are found, check the wiring for continuity, replacing the motor if the wiring is okay. To remove the wiper motor, take out the retaining bolts and pull the motor from the firewall, then remove the spindle nut from the backside and disconnect the electrical connector. For the rear wiper motor, pull back the rear wiper arm cover to access the retaining nut, detach it, and remove the wiper arm. Remove the drive spindle retaining nut, open the rear liftgate, and take out the inside handle, tailgate trim panel, and access cover. Disconnect the electrical connector from the wiper motor, detach the mounting bolts, and remove the wiper motor and linkage assembly, with installation being the reverse of removal.
Posted by ToyotaPartsDeal Specialist 
