window is dry. By switching rear window intermittent wiping off and then back on, you can override this feature and activate the rear window wiper immediately.
The intermittent wiping for the front windshield depends on the driving speed. The higher the speed, the faster the wipers move.
If the wiper blades freeze to the windshield, loosen them carefully. Volkswagen recommends using a deicing spray.
If the front wipers are on, the rear wiper is switched on automatically when backing up.
Windshield wiper functions