GF82.30-P-3004FL Windshield Wiper, Function

GF82.30-P-3004FL Windshield Wiper, Function

General function requirements
^ C. 15R On

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

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

The windshield wiping function consists 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) via the wiper/inside rearview mirror LIN (LIN 2)

The reaction wiping function is interrupted immediately under the following conditions:
- Activating windshield wash function
- Activating touch wiping function
- Activating wipe stop function by engine hood anti-theft alarm system switch (S62)
(with code (551) Anti-theft alarm system (ATA [EDW]))

The reaction wiping function is also canceled if blocking of the wiper motor is detected.

The rear SAM control unit with fuse and relay module (N10/2) reads in the status of the engine hood anti-theft alarm system and transmits it to the front SAM control unit via the interior CAN.

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 is transmitting circuit status c. 50. The electronic ignition lock control unit transmits circuit status c. 50 to the front SAM control unit via the interior CAN.

Intermittent wipe function sequence
The intermittent wipe function is activated by turning the combination switch to position "1" (rain/light sensor (B38/2) low sensitivity) or to position "2" (rain/light sensor high sensitivity). The steering column tube module directly reads in the switch position of the multifunction switch and transmits this to the front SAM control unit via the chassis CAN.
The front SAM control unit reads this in and transmits it via the wiper/inside rearview mirror LIN (LIN 2) to the rain/light sensor The rain/light sensor uses the position of the combination switch and the degree of wetting of the windshield to calculate the frequency of the required wiping operations and transmits the corresponding request via the wiper/inside rearview mirror LIN back to the front SAM control unit, which then actuates the wiper motor accordingly.

The intermittent wipe function is interrupted under the following conditions:
- Activating wipe/stop function
- Activating wash function
- Activating touch wiping function
- Activating after wipe function
- Activating reaction wipe function
- Activating wiper start suppression function
- Turning combination switch to position "0", "3" or "4"
- Blocking wiper motor
- Missing or incorrect data from the rain/light sensor

Function sequence of wiping at specified speed
The wipe function at a 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 steering column tube module directly reads in the switch position of the multifunction switch and transmits this to the front SAM control unit via the chassis CAN. The front SAM control unit actuates the wiper motor accordingly.

The wash function with predefined speed is interrupted under the following conditions:
- Activating wipe/stop function
- Activating wash function
- Activating after wipe 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

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.

The steering column tube module directly reads in the switch position of the multifunction switch and transmits this to the front SAM control unit via the chassis CAN. The front SAM control unit actuates the wiper motor accordingly.

If the combination switch is held in position "0" for longer than t = 30 s, the front SAM control unit regards this as a "stuck combination switch" and interrupts the touch wiping function despite the current request.

The speed at which the windshield wiper is moved for touch wiping 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
- Activating after wipe function
- Activating wipe interruption during engine start function
- Blocking wiper motor