(Windshield Washer, Function - GF82.35-P-3002GR)

MODEL 166 

up to model year 2016 

Function requirements, general 

• Circuit 15R ON

The electronic ignition lock control unit (N73) transmits the status of circuit 15 via the interior CAN (CAN B) to the SAM control unit (N10).

Washing windshield, general 

The windshield is kept clean by washing the windshield.

The windshield wash 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 (Antitheft 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 steering column tube module control unit (N80) directly reads in the switch position of the combination switch and sends this via chassis CAN 1 (CAN E1), electronic ignition lock control unit and interior CAN to the SAM control unit.

The SAM control unit receives the request and actuates the windshield washer system pump (M5/1).

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: Afterwiping takes place once.
• Actuation time t > 1 s: Afterwiping takes place three times.

The SAM control unit sends the "Afterwiping active" status via roof LIN (LIN B13) 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 

When the engine starts, the SAM control unit blocks the actuation of the windshield washer system pump.

Any wiping procedure already started is terminated.

The engine start is recognized by the transmission of the status of circuit 50. The electronic ignition lock control unit sends the status of circuit 50 via interior CAN to the SAM control unit.

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

If an open engine hood is detected by the status of the left engine hood contact switch (S62/43), the 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 over the interior CAN to the SAM control unit.

The SAM control unit directly reads in the status of the left engine hood contact switch.

	Electrical function schematic for windshield washer		PE82.35-P-2051-97NAA
	Overview of system components for windshield wiper system		GF82.30-P-9996GR