Windshield washer, function - GF82.35-P-3002CE

MODEL 204.0/2 as of model year 2009/YoM 08 

MODEL 204.3 

MODEL 204.9 

Function requirements, general 

• Circuit 15R ON

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

Washing windshield, general 

The windshield is kept clean by washing the windshield.

The windshield washing function is comprised 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".

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 afterwipe 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 afterwipe occurs.
• Actuation time t > 1 s: Three afterwipes occur.

On vehicles with code (345) Rain sensor, the front SAM control unit sends the status "afterwiping active" via wiper/inside rearview mirror LIN to the rain/light sensor (B38/2). 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 

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.

The engine start is detected when the status of circuit 50 is sent from the electronic ignition lock control unit to the front SAM control unit.

Function sequence for wash stop (with code (551) Anti-theft alarm system (ATA [EDW])) 

If an open engine hood is recognized via the status of the engine hood switch pedestrian protection + ATA [EDW] Hall sensor (A38/1) (with code (U60) Pedestrian protection) or of the left engine hood contact switch (S62/43) (without code (U60) Pedestrian protection), the front SAM control unit aborts the actuation of the windshield washer system pump.

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

The instrument cluster (A1) transmits the vehicle speed via interior CAN to the front SAM control unit.

The rear SAM control unit with fuse and relay module (N10/2) reads in the status of the engine hood switch pedestrian protection + ATA [EDW] Hall sensor or of the left engine hood contact switch directly and sends this via interior CAN to the front SAM control unit.

	Electrical function schematic for windshield washer		PE82.35-P-2051-97FAB
	Overview of system components, wiper system (WSA)		GF82.30-P-9997CE