Windshield wiper, function - GF82.30-P-3004CE

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).

Wiping windshield, general

The windshield wiping function keeps the windshield free of water, snow, etc.

The windshield wiping function is comprised of the following subfunctions:

Reaction wiping function sequence
Function sequence for interrupting wiping during engine start
Intermittent wipe function sequence
Function sequence of wiping at specified speed
Touch wiping function sequence

Reaction wiping function sequence

The reaction wipe function is activated by turning the multifunction switch (S4) to an intermittent wipe stage.

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 then actuates the wiper motor (M6/1) over the wiper/inside rearview mirror LIN (LIN 2).

The reaction wiping function is interrupted, if one of the following functions is activated:

Activation of the windshield wash function
Activation of the touch wiping function
Activation of the wipe/stop function (with code (551) Anti-theft alarm system (ATA [EDW]))
Blocking wiper motor

Function sequence for interrupting wiping during engine start

During engine start, the front SAM control inhibits the actuation of the wiper motor.

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 to the front SAM control unit via interior CAN.

Intermittent wipe function sequence

By turning the combination switch to position "1" (wiping with a longer interval time) or to position "2" (wiping with a shorter interval time), the intermittent wipe function is switched on.

The steering column tube module control unit directly reads in the position of the combination switch and transmits it to the front SAM control unit via the chassis CAN. The front SAM control unit then actuates the wiper motor accordingly via the wiper/inside rearview mirror LIN.

On vehicles without code (345) Rain sensor, the time intervals for wiping are defined depending on the switch position of the multifunction switch.

On vehicles with code (345) Rain sensor, the rain/light sensor (B38/2) calculates the frequency of the required wipe actions depending on the switch position of the multifunction switch and the quantity of moisture on the windshield.

The corresponding switch position influences the sensitivity of the rain/light sensor.

Switch position for multifunction switch "1", low sensitivity
Switch position for multifunction switch "2", high sensitivity

The front SAM control unit sends the switch position of the multifunction switch via the wiper/inside rearview mirror LIN to the rain/light sensor, which calculates the frequency of the required wipe actions and sends the corresponding requests back to the front SAM control unit.

The front SAM control unit then actuates the wiper motor accordingly via the wiper/inside rearview mirror LIN.

On model 204.0/2 with code (414) Power glass tilting/sliding roof, the data from the rain/light sensor is simply looped through by the overhead control panel control unit (N70).

The intermittent wipe function is interrupted under the following conditions:

Activating wipe/stop function
Activating wash function
Activation of the touch wiping function
Activation of afterwipe function
Activating reaction wipe function
Activating wiper start suppression function
Turning combination switch to position "0", "3" or "4"
Blocking wiper motor

If errors are present in the data from the rain/light sensor, the intermittent wipe function is also interrupted. The wiper motor is then actuated at the defined time intervals.

Function sequence of wiping at specified speed

The wipe function with predefined speed is activated by turning the multifunction switch to position "3" (continuous wipe at low speed) or position "4" (continuous wipe at high speed):

The wash function with predefined speed is interrupted under the following conditions:

Activating wipe/stop function
Activating wash function
Activation of afterwipe function
Activating the speed reduction function (not for vehicles with code (494) USA version)
Turning the combination switch to position "0", "1", or "2"
Blocking wiper motor

The data from the rain/light sensor is not taken into consideration when the wipe function with predefined set speed is active.

Touch wiping function sequence

The touch wiping function can only be activated, if the multifunction switch is set to positions "0", "1" or "2". If the windshield wiper is not located in the rest position, the request of the combination switch is ignored.

The touch wiping function is activated by pressing the multifunction switch up to the catch point.

Single wipe:
For a single touch wipe, briefly depress the combination switch as far as the detent point.
Repeated wiping:
If the multifunction switch is actuated for a longer period of time, wiping is accomplished for the time actuated, however, only for a maximum of t = 30 s.

If the multifunction switch is held in position "0" for longer than t = 30 s, a "sticking multifunction switch" is assumed and the touch wiping function is interrupted despite of the current request.

The speed at which the windshield wiper is moved, corresponds to the wiping speed in position "3" (continuous wipe at low speed).

The touch wiping function is interrupted under the following conditions:

Activating wash function
Activation of afterwipe function
Activating wipe interruption during engine start function
Blocking wiper motor

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