GF82.35-P-3002FL Windshield Washer, Function

GF82.35-P-3002FL Windshield Washer, Function

General function requirements
^ C. 15R On

The electronic ignition lock control unit (N73) transmits circuit 15 status to the front SAM control unit with fuse and relay module (N10/1) via the interior CAN (CAN B).

Washing windshield, general
The windshield is kept clean by washing the windshield.

The windshield washing function consists of the following subfunctions:
^ Washing function sequence
^ Afterwiping function sequence
^ Function sequence for interrupting washing during engine start
^ Function sequence for wash stop

Washing function sequence
The washing function is activated by pressing the combination switch (S4) in axial direction beyond the detent point.
The steering column tube module control unit (N80) directly reads in the position of the combination switch and transmits it to the front SAM control unit via the chassis CAN (CAN E).
The front SAM control unit receives the request and then actuates the windshield washer system pump (M5/1) directly.
During washing, wiping takes place with the wiper speed set on the combination switch.
When the combination switch is in the rest position, wiping takes place with speed "3".

The washing function is interrupted under the following conditions or after t = 15 s:
- Activation of the washer interruption function when the engine starts
- Activating wipe/stop function
- "Combination switch stuck" detection

Afterwiping function sequence
The afterwiping function is activated as soon as the combination switch is no longer activated.
The number of after wipe cycles depends on the combination switch actuation time:
- Actuation time t < 200 ms: Afterwiping does not take place.
- Actuation time t < 1 s: A single after wipe occurs.
- Actuation time t > 1 s: Three afterwipes occur.

The front SAM control unit transmits "afterwiping active" status to the rain/light sensor (B38/2) via the wiper/inside rearview mirror LIN. Wiping requests from the rain/light sensor during afterwiping are ignored.
Afterwiping takes place with the wiper speed set on the combination switch.
When the combination switch is in the rest position, afterwiping takes place with speed "3".

The afterwiping function is interrupted or aborted under the following conditions:
- Activation of the washer interruption function when the engine starts
- Wiper motor (M6/1) blockage detection
- Activating wash function
- Activating wipe/stop function

Function sequence for interrupting washing during engine start
When the engine starts, the front SAM control unit blocks the actuation of the windshield washer system pump.
Any wiping procedure already started is terminated.
The engine start is recognized is transmitting circuit status c. 50.
The electronic ignition lock control unit transmits circuit status c. 50 to the front SAM control unit via the interior CAN.

Function sequence for wash stop
If an open engine hood is detected via the engine hood anti-theft alarm system switch (S62) (with code (551) Anti-theft alarm system (ATA)), the front SAM control unit aborts actuation of the windshield washer system pump.

If the engine hood is closed, the windshield washer system pump can be actuated again.
This is also possible if the engine hood is open and the vehicle speed exceeds v > 8 km/h.

The instrument cluster (A1) transmits the vehicle speed information to the front SAM control unit via the interior CAN.
The status of the engine hood anti-theft alarm system switch is read in by the rear SAM control unit with fuse and relay module (N10/2) and transmitted to the front SAM control unit via the interior CAN.