Wiper system automatic speed reduction, function - GF82.30-P-4006CE

MODEL 204.0 /2 except CODE (494) USA version as of model year 2009 /YoM 08 

MODEL 204.3 except CODE (494) USA version 

MODEL 204.9 except CODE (494) USA version 

Function requirements, general 

• Circuit 15R ON
• Combination switch (S4) in position "3" or "4"
• Vehicle speed reduction from v > 6 km/h to v < 3 km/h

Automatic wiper speed reduction, general 

At low speeds a lower quantity of moisture is assumed on the windshield, therefore the front SAM control unit with fuse and relay module (N10/1) activates the automatic speed reduction of the wiper system.

The wiper system automatic speed reduction comprises the following subfunctions:

• Function sequence for automatic wiper speed reduction, general 
• Function sequence for deactivating automatic wiper speed reduction 

Function sequence for automatic wiper speed reduction, general 

If the front SAM control unit recognizes a vehicle deceleration of v > 6 km/h to v < 3 km/h, it switches the wiping speed of the wiper motor (M6/1) back one stage over the wiper/inside rearview mirror LIN (LIN 2).

The circuit 15R status is sent by the electronic ignition lock control unit (N73) over the interior CAN (CAN B) to the front SAM control unit.

The instrument cluster (A1) transmits the vehicle speed information to the front SAM control unit via the interior CAN.

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).

Function sequence for deactivating automatic wiper speed reduction

The wiper motor is actuated at the wiper speed set before activating the automatic speed reduction function of the wiper system if one of the following events occur:

• Vehicle speed v > 6 km/h
• Changing wiper speed
• Activation of the touch wiping function
• Activating wash function

	Electrical function schematic for automatic speed reduction		PE82.30-P-2053-97FAB
	Overview of system components, wiper system (WSA)		GF82.30-P-9997CE