Windshield washer, function - GF82.35-P-3002GM

MODEL 164.1 as of Model Year 09/Modification Year 08 model refinement package 

MODEL 164.8, 251.0/1 as of Model Year 09/Modification Year 08 

General function requirements 

• C. 15R On

Washing windshield, general 

The windshield is kept clean by washing the windshield.

The windshield wash function consists of the following subfunctions:

• Washing function sequence 
• After wiping function sequence 
• Function sequence for interrupting washing during engine start 

Washing function sequence 

The washing function is activated by pressing the combination switch (S4) down beyond the catch point.

The position of the combination switch is read in by the steering column tube module (N80) and transmitted to the engine compartment CAN. The central gateway control unit (N93) routes the signals to the interior CAN.

The front SAM control unit (N10) actuates the window washer fluid pump (M5/1) correspondingly.

During the wash cycle, wiping takes place at the wiper speed set using the combination switch. When the combination switch is in the rest position, wiping takes place at stage "3".

Windshield washing is interrupted by the wipe-stop function or when a "stuck switch" is recognized after t = 15 s.

After wiping function sequence 

After wiping becomes active as soon as the combination switch is no longer activated. The number of afterwipe cycles depends on the operation time of the combination switch.

• Actuation time t < 1 s:

  A single afterwipe occurs.

• Actuation time t > 1 s:

  Three after wipes occur.

An active afterwipe is notified to the rain/light sensor (B38/2). Consequently, no wiping requests of the rain/light sensor are made during after wiping.

After wiping is carried out at the wiper speed set at the combination switch. When the combination switch is in the rest position, after wiping takes place at stage "3".

Function sequence for interrupting washing during engine start 

When starting the engine the window washer fluid pump actuation is blocked by the front SAM control unit.

Any wiping procedure already started is terminated.

The motor start is recognized by connecting c. 50 from the EIS control unit (N73) to the front SAM control unit.

	Electrical function schematic for windshield washer	Model 164	PE82.35-P-2051-97MAA
		Model 251	PE82.35-P-2051-97RAA
	Front SAM control unit, component description	N10	GF54.21-P-7010GM
	Component description for the EZS control unit	N73	GF80.57-P-6003GM
	Component description for the steering column module control unit	N80	GF54.21-P-6051GM
	Central gateway control unit, component description	N93	GF54.21-P-4170GM