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

Model 190 

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).

Wiping windshield, general 

The windshield wiper function is comprised of the following subfunctions:

• Intermittent wipe function sequence 
• Single wipe function sequence 
• Function sequence of wiping at specified speed 
• Function sequence for interrupting wiping during engine start 
• Wiper start suppression function sequence 
• Function sequence for wipe stop 
• Function sequence for automatic speed reduction of windshield wiper system (except CODE 494 (USA version)) 

Intermittent wipe function sequence 

The intermittent wipe function is activated by turning the combination switch (S4) to switch position "1" (rain/light sensor (B38/2) low sensitivity) or to switch position "2" (rain/light sensor high sensitivity).

When switched from position "0" to position "1" or "2", there is an automatic wipe cycle, the so-called "Reaction wipe".

The steering column tube module control unit (N80) reads in the switch position of the combination switch directly and transmits this up to 30.11.2018 via suspension CAN 1 (CAN E1) and as of 01.12.2018 via the AMG FlexRay (Flex AMG), the AMG gateway control unit (N93/9) and suspension CAN 1 to the front SAM control unit.

The front SAM control unit sends information on the wiping sensitivity via the wiper/inside rearview mirror LIN (LIN 2) to the rain/light sensor.

Based on the position of the combination switch and the degree of wetness on the windshield, the rain/light sensor calculates the frequency of the required wiping cycles and sends a corresponding request back to the front SAM control unit via the wiper/inside rearview mirror LIN. The front SAM control unit then actuates the master wiper motor (M6/6) via the wiper/inside rearview mirror LIN. The master wiper motor actuates the slave wiper motor (M6/7) accordingly.

The intermittent wipe function is interrupted under the following conditions:

• Activating wipe/stop function
• Activating wash function
• Activating single wipe function
• Activation of extended wiping function
• Activating wiper startup suppression function
• Turning combination switch to switch position "0", "3" or "4"
• Blocking of a wiper motor
• Faulty or defective data for rain/light sensor

If the rain/light sensor provides incorrect data, the wiper motors are actuated with defined time intervals.

Single wipe function sequence 

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

The single wipe function is activated by pressing the combination switch up to the detent point.

Wipe once:

To wipe once, briefly push the combination switch to the detent point.

Repeated wiping:

If the combination switch is pressed for longer, wiping takes place according to the actuation duration, however for a max. of t = 30 s.

The steering column tube module control unit reads in the switch position of the combination switch directly and transmits this up to 30.11.2018 via suspension CAN 1 and as of 01.12.2018 via AMG FlexRay, the AMG gateway control unit and suspension CAN 1 to the front SAM control unit. The front SAM control unit then actuates the master wiper motor via the wiper/inside rearview mirror LIN. The master wiper motor actuates the slave wiper motor accordingly.

If the combination switch is pressed to the switch position "0" for longer than t = 30 s, the front SAM control unit evaluates this as a "stuck combination switch" and cancels the single wipe function in spite of the pending request.

The speed at which the windshield wipers are moved corresponds to the wiping speed in switch position "3" (continuous wipe at low speed).

The single wipe function is interrupted under the following conditions:

• Activating wash function
• Activation of extended wiping function
• Activating wipe interruption during engine start function
• Blocking of a wiper motor

Function sequence of wiping at specified speed 

The wipe function with predefined speed is activated by turning the combination switch to switch position "3" (continuous wipe at slow speed) or switch position "4" (continuous wipe at fast speed).

The steering column tube module control unit reads in the switch position of the combination switch directly and transmits this up to 30.11.2018 via suspension CAN 1 and as of 01.12.2018 via AMG FlexRay, the AMG gateway control unit and suspension CAN 1 to the front SAM control unit. The front SAM control unit then actuates the master wiper motor via the wiper/inside rearview mirror LIN. The master wiper motor actuates the slave wiper motor accordingly.

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

• Activating wipe/stop function
• Activating wash function
• Activation of extended wiping function
• Activation of speed reduction function (except CODE 494 (USA version))
• Turning combination switch to switch position "0", "1" or "2"
• Blocking of a wiper motor

Function sequence for interrupting wiping during engine start 

When the engine starts, the front SAM control unit blocks the actuation of the wiper motors. 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.

Additional function requirements for wiper start suppression 

• Vehicle speed v < 3 km/h:

  The instrument cluster (A1) sends information on the vehicle speed to the front SAM control unit via the user interface CAN (CAN HMI), the AMG gateway control unit and interior CAN.

• Combination switch in switch position "1" or "2":

  The steering column tube module control unit reads in the switch position of the combination switch directly and transmits this up to 30.11.2018 via suspension CAN 1 and as of 01.12.2018 via AMG FlexRay, the AMG gateway control unit and suspension CAN 1 to the front SAM control unit.

• Rain and light sensor detects when the windshield becomes wet:

  Wetting of the windshield is detected by the rain/light sensor. The rain/light sensor data is read in by the front SAM control unit via the wiper/inside rearview mirror LIN.

Wiper start suppression function sequence 

The wiper startup suppression is intended to prevent people from being sprayed with water from the windshield when getting in or out of the vehicle as the result of an initiated wipe operation. The windshield wipers remain in the park position despite a wipe request triggered manually or automatically.

If a door is opened during wiping, the front SAM control unit interrupts the actuation of the master wiper motor. The master wiper motor interrupts the actuation of the slave wiper motor.

Opening of the left door is detected by the status of the left door lock rotary tumbler switch (A85s1) in the left door lock (A85). The left door control unit (N69/1) directly reads in the status of the left door lock rotary tumbler switch and sends it via the interior CAN to the front SAM control unit.

Opening of the right door is detected by the status of the right door lock rotary tumbler switch (A85/1s1) in the right door lock (A85/1). The right door control unit (N69/2) directly reads in the status of the right door lock rotary tumbler switch and sends this via the interior CAN to the front SAM control unit

The front SAM control unit reads in all relevant information, evaluates it, and interrupts actuation of the master wiper motor. The master wiper motor interrupts the actuation of the slave wiper motor. An already started wiping procedure is not interrupted immediately. The wipers continue to move to the park position.

The wiper start suppression is deactivated under the following circumstances:

• Vehicle speed: v ≥ 3 km/h:

  The instrument cluster sends information on the vehicle speed via the user interface CAN, AMG gateway control unit, and interior CAN to the front SAM control unit.

• Combination switch in switch position "3" or "4":

  The steering column tube module control unit reads in the switch position of the combination switch directly and transmits this up to 30.11.2018 via suspension CAN 1 and as of 01.12.2018 via AMG FlexRay, the AMG gateway control unit and suspension CAN 1 to the front SAM control unit.

• Single wipe or wash function activated
• Driver and front passenger door closed and gear range "D" or "R" engaged:

  The dual-clutch transmission control unit (N15/13) sends the current drive range to the front SAM control unit via the drive CAN (CAN C1), powertrain control unit (N127), and suspension CAN 1.

• Change from circuit 15C to circuit 15R:

  The electronic ignition lock control unit sends the status of circuit 15 to the front SAM control unit via the interior CAN.

With circuit 15R On, no information about the current drive range is sent to the front SAM control unit. Instead, "Gear range N" is constantly sent. The current gear range is only available as of circuit 15 On. The wiper startup suppression function is not canceled by circuit15R On through the status of the gear range.

Additional function requirements for wipe stop 

• Wipe or wash function active:

  The steering column tube module control unit reads in the switch position of the combination switch directly and transmits this up to 30.11.2018 via suspension CAN 1 and as of 01.12.2018 via AMG FlexRay, the AMG gateway control unit and suspension CAN 1 to the front SAM control unit.

• Vehicle speed v < 3 km/h:

  The instrument cluster sends information on the vehicle speed via the user interface CAN, AMG gateway control unit, and interior CAN to the front SAM control unit.

Function sequence for wipe stop 

The wipe stop function prevents the master wiper motor and slave wiper motor from being actuated by the front SAM control unit with the engine hood open and thus causing damage to the vehicle. If the hood is opened at a speed of v < 3 km/h, the front SAM control unit immediately stops the master wiper motor actuation. The master wiper motor interrupts the actuation of the slave wiper motor.

At a speed of v > 6 km/h, the wiper stop function is deactivated, i. e. the wiper motors are actuated again from this speed onwards.

The open engine hood is detected by the status of the right engine hood contact switch (S62/42). The front SAM control unit directly reads in the status of the right engine hood contact switch.

Additional function requirement for automatic speed reduction of windshield wiper system (except CODE 494 (USA version)) 

• Combination switch in switch position "3" or "4":

The steering column tube module control unit reads in the switch position of the combination switch directly and transmits this up to 30.11.2018 via suspension CAN 1 and as of 01.12.2018 via AMG FlexRay, the AMG gateway control unit and suspension CAN 1 to the front SAM control unit.

Function sequence for automatic speed reduction of windshield wiper system (except CODE 494 (USA version)) 

It is assumed that the windshield does not become as wet at slow speeds. For this reason, the front SAM control unit reduces the wiper speed as soon as vehicle deceleration from v > 6 km/h to v < 3 km/h is detected.

The front SAM control unit reads in all relevant information, evaluates it, and switches the wipe speed of the wiper motors back by one stage via the wiper/inside rearview mirror LIN.

The speed reduction is canceled under the following conditions:

• Vehicle speed v > 6 km/h
• Changing wiper speed
• Activating single wipe function
• Activating wash function

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