- Terminal 53 supplies voltage for the windshield wipers to operate at first speed.
- Terminal 53a supplies positive current to set the windscreen wipers to the end position.
- That is, the windshield wiper motor receives positive current through this terminal until the motor reaches the parking position.
- Terminal 53b supplies voltage for operation of the windshield wipers at the second speed.
- Terminal 53e brakes the windscreen wiper motor when it reverses after being switched off to prevent the windscreen wipers from moving beyond the parking position.
- Terminal 31 provides ground contact.
Tip: When the ignition is on, the windshield wiper blades must not be blocked outside their initial position – for example, by snow or freezing. In this case, voltage is continuously supplied from terminal 53a. Since the windshield wiper motor cannot rotate due to the blocked blades, it will burn out after a certain time.