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

Model 213 up to model year 2021 

Function requirements, general 

Wiping windshield, general 

The windshield wiper function is comprised of the following subfunctions:

Function sequence for automatic wiping 

The automatic wiping function is activated by turning the combination switch (S4) to switch position "1" (rain sensor (B38/2b1) in the rain/light sensor with additional functions (B38/2) low sensitivity) or switch position "2" (rain sensor high sensitivity).

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

The steering column tube module control unit (N80) directly reads in the switch position of the combination switch and sends it to the front SAM control unit via the chassis FlexRay (Flex E), electronic ignition lock control unit and interior CAN.

The front SAM control unit sends the wipe sensitivity via rain/light sensor LIN (LIN B16) to the rain/light sensor with additional functions. The rain/light sensor with additional functions uses the wipe sensitivity and the amount of windshield wetness as a basis for calculating the frequency of required wipe procedures, and then sends the corresponding wipe request back over the rain/light sensor LIN to the SAM control unit. The front SAM control unit then actuates the wiper motor (M6/1) over the rain/light sensor LIN correspondingly. The wetness of the windshield is detected by the rain sensor in the rain/light sensor with additional functions. The rain/light sensor with additional functions reads in the signals from the rain sensor directly and evaluates them.

The automatic wiping function is aborted under the following conditions:

Additional function requirements for single wipe 

Single wipe function sequence 

The single wipe function is activated by briefly pressing the multifunction switch up to the catch point. If the combination switch is pressed for longer, wiping takes place in accordance with the duration for which it is pressed, but only for a maximum of t = 30 s. The front SAM control unit actuates the wiper motor over the rain/light sensor LIN accordingly. If the windshield wiper is not located in the rest position, the request of the combination switch is ignored.

IMPORTANT If the combination switch is pressed in the "0" switch position and held down for longer than t = 30 s, the front SAM control unit evaluates this as a "stuck combination switch" and aborts actuation despite 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:

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 sends it via chassis FlexRay, the electronic ignition lock control unit and interior CAN to the front SAM control unit. The front SAM control unit then actuates the wiper motor over the rain/light sensor LIN correspondingly.

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

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 transmits the status of circuit 50 to the front SAM control unit via the interior CAN.

Additional function requirements for wiper start suppression 

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 wiper motor. To do this, the following variables are taken into account:

Vehicle speed:

The instrument cluster (A1) sends the vehicle speed to the front SAM control unit over the user interface CAN (CAN HMI), electronic ignition lock control unit and interior CAN.

Switch position of the combination switch:

The steering column tube module control unit reads in the switch position of the combination switch directly and sends it via chassis FlexRay, the electronic ignition lock control unit and interior CAN to the front SAM control unit.

Wetting of the windshield:

The wetness of the windshield is detected by the rain sensor in the rain/light sensor with additional functions. The rain/light sensor with additional functions reads in the signals of the rain sensor directly and sends the corresponding wipe request over the rain/light sensor LIN (LIN) to the front SAM control unit.

Status of doors:

The left front door control unit (N69/1) transmits the status of the left front door via the interior CAN to the front SAM control unit. The right front door control unit (N69/2) transmits the status of the right front door 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 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:

IMPORTANT Model 213 with transmission 725 up to model year 2021

With circuit 15R ON, the fully integrated transmission control unit transmits no information about the current gear range, but constantly transmits gear range "N". The current gear range is only available as of circuit 15 On. The wiper startup suppression function is not canceled by circuit 15R On through the status of the gear range.

Additional function requirements for wipe stop 

Function sequence for wipe stop 

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

The open engine hood is detected by the status of the right engine hood contact switch (S62/42) and the left engine hood contact switch (S62/43). The front SAM control unit directly reads in the status of the right engine hood contact switch and the left engine hood contact switch.

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

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 instrument cluster sends the vehicle speed to the front SAM control unit over the user interface CAN (CAN HMI), electronic ignition lock control unit and interior CAN.

The automatic speed reduction function of the windshield wiper system is interrupted under the following conditions:

  Electrical function schematic for windshield wiper   PE82.30-P-2051-97DBA
  Overview of system components for windshield wiper system   GF82.30-P-9996FG 
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