Prerequisite For Washer Systeming

Function prerequisite: term. 15R: ON

Function procedure
- The combination switch (S4) is pushed beyond the engaging point,
- the signal from the combination switch (S4) is read in by the pushbutton control module (N73) and the relevant message put onto the interior CAN,
- the front SAM control module with fuse and relay module (N10/1) receives this message,
- the front SAM control module with fuse and relay module (N10/1)actuates the wiper motor (M6/1) via a relay and the windshield washing water pump (M5/1) via a semiconductor switch:
- The windshield washing water pump (M5/1) is actuated for as long as the combination switch (S4) is activated.
- If the combination switch (S4) is no longer being activated, the wiper motor (M6/1) is actuated for after-wiping.
The number of after-wiping cycles depends on the activation time of the combination switch (S4):
- With an activation time of less than one second, one after-wiping cycle is carried out.
- With a longer period of operation three after-wiping cycles are carried out. This also applies if the combination switch (S4) is activated again during after-wiping and the total activation time is therefore more than one second.
If another request is made during these three after wiping cycles, three more after-wiping cycles are carried out.

- When after-wiping is complete, the wiper motor (M6/1) is braked.


NOTE:
During washing the wiper motor (M6/1) is actuated at setting 1.
Wiping at setting 2 during washing only takes place if wiping at setting 2 is set at the same time.


Washer pump actuation
The windshield washing water pump (M5/1) is actuated directly by the front SAM control module with fuse and relay module (N10/1).

During washing the motor of the windshield washing water pump (M5/1) is switched to ground via an electronic switch (transistor) of the control module.


NOTE: If an overload occurs, the front SAM control module with fuse and relay module (N10/1) switches the pump off.