Windshield Washer System (SWA)

Windshield Washer System (SWA)

A washing program is activated depending on the wiper position, direction of movement and the actuation time of the windshield washer switch. During each upward stroke of the wiper arm, the windshield is wet using 2 nozzle outlets in both wiper arms in front of the wiper blade.




Washing program:

- Washer contact is operated.
- Washer pump is activated.
- The upwards stroke of the wiper is executed with a delay of 500 ms. This delay ensures that the wiper blade is pre-wet.
- Shortly before reaching the upper reversing position, the washer pump is deactivated in order to reduce soiling of the side windows.
- The windshield is not wet during the downward stroke (the downward stroke dries the windshield).
- After releasing the washer contact, 3 final wiping cycles are executed (three complete upward/downward strokes).

If the rain sensor is activated, a final wipe cycle (three continuous wiping operations) is executed. The control unit then switches back to rain sensor operation.

An intensive cleaning system such as in the E38 is no longer used. The reasons for this are:

- Customer servicing costs
- Environmental concerns