To check the windshield wiper motor, disconnect the electrical connector from the wiper motor assembly. Use jumper wires to apply battery voltage to the B terminal (green/black wire) and ground the Lo terminal (blue wire) to see if the wiper operates at low speed. Then connect the battery positive terminal to the B terminal and the negative terminal to the Hi terminal (blue/yellow wire) to check for high-speed operation. If the motor does not run at either speed, it needs replacement. For replacement, detach the wiper arms by removing the acorn nut and pulling the arm off its splined shaft. Remove the hood seal and cowl panel by prying off trim clips and removing screws, then unplug the electrical connector. Take out the four mounting bolts for the wiper motor and linkage frame, turn the frame assembly over for access, and remove the retaining nut to detach the linkage from the motor. Next, remove the three mounting bolts to separate the motor from the wiper linkage. Installation involves reversing the removal steps, ensuring to lubricate the contact points of the wiper linkage with multi-purpose grease before installing the new motor assembly. For the rear wiper motor, open the lift gate and remove the wiper motor cover, then disconnect the electrical connector. Use jumper wires to apply battery voltage to the no. 2 terminal (green/black wire) and ground the number 4 terminal (green wire) to check if the wiper runs smoothly; if not, it should be replaced. For replacement, detach the wiper arm and remove the rubber seal, shaft nut, and washer. Open the lift gate, remove the wiper motor cover, and unplug the electrical connector. Support the motor with one hand while removing the three retaining nuts, then lower the wiper motor from the vehicle. Installation follows the reverse order of removal.