GF82.35-D-3002H Windshield Washer, Function

GF82.35-D-3002H Windshield Washer, Function


The windshield wiper system (WSA) is ready for operation as from "circuit 15R ON".
The "windshield wash" function is activated by pressing the windshield washer system switch (S144s3) integrated in the combination switch (S144) beyond the actuation point.
Pressing the windshield washer system switch beyond the actuation point for < 1 s triggers a single afterwipe. Pressing the windshield washer system switch beyond the actuation point for > 1 triggers 3 afterwipes. The windshield washer system switch signals are read in over the MRM control unit (N80) and forwarded to the Controller Area Network bus Class B (interior) (CAN-B).

The SAM control unit (N10) reads in the signals and actuates over the stage 1+2 front windshield wiper relay (K40/9k2) and front windshield wiper relay (K40/9k4) the windshield wiper motor (M6/1) and the windshield washer fluid pump (M5/1).

Park position
With "circuit 15R OFF", the front wipers remain in their current position. If status "circuit 15R ON" is activated again, the front wipers are moved back to their park positions (completion of wiping).

The "windshield wash" function has priority over the activated "windshield wipe" function, which is set forth following termination of the "windshield wash" function. With the "windshield intermittent wipe" function, the interval window is reset to "0".

Startup suppression
On vehicles with code (JA5) Light/rain sensor, startup suppression of the front wipers is performed under the following conditions to preserve the windshield WSA:
- Circuit 15R ON
- v = 0 km/h
- Measured outside temperature < +4 °C

Deactivation of the startup suppression takes place if one of the following conditions is met:
- v > 0 km/h
- Combination switch is actuated

Deactivation of the startup suppression is active until the next change in status "circuit 15R OFF".

Blockage detection function
The SAM control unit detects over circuit 31B any blockage of the windshield wiper motor.
A blockage of the windshield wiper motor is detected under the following conditions:
- Park position not exited after t = 4 s.
- Park position not reached after t = 12 s.

After blockage is detected, the windshield wiper motor is deactivated.
If the windshield washer system switch is operated again, another attempt is made to switch on the windshield wiper motor over the SAM control unit.

Washer fluid supply
The spray nozzles on the windshield WSA are supplied with washer fluid by the windshield washer fluid pump. The windshield washer fluid pump is located on the windshield washer fluid reservoir.
The windshield washer fluid reservoir has a capacity of 7 l. If a signal is sent by the windshield washer fluid level indicator switch (S42) indicating that the windshield washer fluid reservoir is only 1/3 full, the multifunction display in the instrument cluster (A1) shows the message "Check washer fluid level".
When the windshield washer fluid reservoir is empty, the washer fluid level indicator lamp (A1e28) in the instrument cluster lights permanently.