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

MODEL 216.3, 221.0/1 as of model year 09/YoM 08 except CODE (494) USA version 

Function requirements, general 

• C. 15R On
• Combination switch (S4) in position "3" or "4"
• Speed v < 5 km/h

Automatic wiper speed reduction, general 

Since it is assumed that the quantity of moisture on the windshield will be lower at low vehicle speeds, the automatic speed reduction is actuated when the vehicle speed is reduced to v < 5 km/h.

Automatic wiper 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 vehicle speed is reduced to v < 5 km/h, the front SAM control unit with fuse and relay module (N10/1) switches the master wiper motor (M6/6) back one wiper speed. The master wiper motor then switches the slave wiper motor (M6/7) back one wiper speed.

Function sequence for deactivating automatic wiper speed reduction 

Actuation of the wiper motor at the speed before automatic speed reduction is accomplished by one of the following events:

• Vehicle speed v > 8 km/h
• Changing wiper speed
• Activation of the touch wiping or washing function

The position of the combination switch is read in by the steering column tube module (N80) and placed on the chassis CAN. The central gateway control unit (N93) routes the combination switch request to the front SAM control unit via the interior CAN.

The front SAM control unit receives the signal for the vehicle speed from the instrument cluster (A1). The central gateway control unit routes the vehicle speed to the front SAM control unit via the interior CAN.

	Electrical function schematic for automatic speed reduction	Model 216	PE82.30-P-2053-97CAA
		Model 221	PE82.30-P-2053-97SAA
	Instrument cluster, component description	A1	GF54.30-P-6000LE
	Front SAM control unit with fuse and relay module, component description	N10/1	GF54.21-P-6070LE
	Component description for the EZS control unit	N73	GF80.57-P-6003LE
	Steering column module, component description	N80	GF54.21-P-6050LE
	Central gateway control unit, component description	N93	GF54.21-P-4170LE