How do you repair the rear wiper motor on an Audi a6 avant?

To repair the rear wiper motor on an Audi A6 Avant, first, disconnect the vehicle's battery to ensure safety. Remove the rear wiper arm and the cover panel to access the motor. Disconnect the wiring harness and unbolt the motor from its mounting. If the motor is faulty, replace it with a new one, reassemble the components, and reconnect the battery to test the wiper's functionality.