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

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

General function requirements
^ C. 15R On

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

Washing windshield, general
The windshield is kept clean by washing the windshield.
The windshield wash 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 (with code (551) Anti-theft alarm system (ATA [EDW]))

Washing function sequence
The washing function is activated by pressing the combination switch (S4) in axial direction beyond the detent point. The combination switch is read in by the steering column tube module control unit (N80).
The steering column tube module control unit transmits the "washing" request via chassis CAN (CAN E).
The front SAM control unit receives this 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".

Windshield washing is interrupted by the wipe-stop function or when a "stuck switch" is recognized after t = 15 s
Windshield washing is interrupted by the wash interrupt function when the engine is started

After operating the washing function ten times (with low beams switched on), the headlamp cleaning system pump (M5/2) (with code (600) Headlamp cleaning system) is automatically actuated for cleaning the headlamps. The actuation takes place via the front SAM control unit. The internal counter is reset to "0" with circuit 15 Off.

Notification of an active wash operation is sent to the rain/light sensor (B38/2) over the wiper/inside rearview mirror LIN (LIN 2) by the front SAM control unit. This means that wipe requests from the rain/light sensor are not issued during a wash/after wipe operation.

Afterwiping function sequence
Afterwiping is actuated 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.

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".

Afterwiping is interrupted by the wipe stop, wash interrupt at engine start function or by any recognized blockage of the wiper motor (M6/1).

Function sequence for interrupting washing during engine start
Actuation of the windshield washer system pump is inhibited by the front SAM control unit when the engine start is recognized.
Any wiping procedure already started is terminated.
An engine start is detected when the circuit 50 status is sent from the electronic ignition lock control unit to the front SAM control unit.

Function sequence for wash stop
If an open engine hood is detected by the engine hood anti-theft alarm system switch (S62), the actuation of the windshield washer system pump is canceled.
If the engine hood is closed, the windshield washer system pump can be actuated again by the wash function. This also occurs when the engine hood is open and the vehicle speed exceeds v > 8 km/h.

The signal for vehicle speed is received by the front SAM control unit from the instrument cluster (A1) over the interior CAN.

An open engine hood is recognized via the engine hood anti-theft alarm system switch, the status of which is read in by the rear SAM control unit with fuse and relay module (N10/2) and sent over the interior CAN to the front SAM control unit.