Check Fuse
Check the fuse box for a blown fuse related to the rear wiper. If the fuse is blown, it will need to be replaced. Refer to your vehicle's manual for the location of the fuse box and the specific fuse related to the rear wiper.
Wiper Motor Failure
The wiper motor may have malfunctioned. This could be due to a variety of reasons, such as a worn-out motor or an electrical issue. If the motor is faulty, it may need to be replaced.
Wiring Issues
Inspect the wiring that connects the rear wiper motor to the vehicle's electrical system. Look for any visible damage, loose connections, or corroded wires. If any issues are found, they may need to be repaired or replaced.
Switch or Control Module Malfunction
The switch or control module that operates the rear wiper may be faulty. Test the switch to see if it is sending the proper signals to the wiper motor. If the switch is not functioning correctly, it may need to be replaced.
