1. Blown fuse: The rear windshield wiper is protected by a fuse, which can blow if there is a short circuit or overload. Check the fuse box and replace the blown fuse if necessary.
2. Faulty wiring: The wiring for the rear windshield wiper can become damaged or corroded over time, which can prevent the wiper from receiving power. Inspect the wiring for any damage and repair or replace it as needed.
3. Damaged wiper motor: The rear windshield wiper motor can fail due to wear and tear or water damage. Check the wiper motor for any signs of damage and replace it if necessary.
4. Bad wiper transmission: The wiper transmission is responsible for moving the wiper arm back and forth. If the transmission is damaged or worn out, the wiper may not work properly. Check the transmission and linkage for any damage and replace it if necessary.
5. Faulty wiper switch: The wiper switch is responsible for turning the rear windshield wiper on and off. If the switch is faulty, the wiper may not work even if all other components are functional. Check the switch and replace it if necessary.
6. Clogged fluid reservoir: If the rear windshield wiper fluid reservoir is clogged, it may not be able to spray fluid onto the windshield, causing the wiper to be ineffective. Check the reservoir and clean it if necessary.
