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

MODEL 207.3/4

Function requirements, general

Circuit 15R ON

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

Washing windshield, general

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 the axial direction beyond the detent point.

The steering column tube module control unit (N80) reads in the switch position of the combination switch directly and sends this via chassis CAN (CAN E) (up to 31.5.13) or chassis CAN 1 (CAN E1) (as of 1.6.13) to the front SAM control unit, which then directly 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 front SAM control unit transmits the status "Afterwipe active" via the wiper/inside rearview mirror LIN (LIN 2) 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
Blocking of wiper motor (M6/1)
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 by the transmission of the status of circuit 50. The electronic ignition lock control unit transmits the status of circuit 50 to the front SAM control unit via the interior CAN.

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

If an open engine hood is detected via the status of the pedestrian protection Hall sensor + engine hood antitheft alarm system switch (A38/1) (with code (U60) Pedestrian protection) or the left engine hood contact switch (S62/43) (without code (U60) Pedestrian protection), the front SAM control unit interrupts 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 via interior CAN to the front SAM control unit.

The status of the pedestrian protection Hall sensor + engine hood antitheft alarm system switch or the left engine hood contact switch is read in directly by the rear SAM control unit with fuse and relay module (N10/2) and transmitted via the interior CAN to the front SAM control unit.

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