Headlamp cleaning system (HCS), function - GF82.15-P-0002S: Notes

MODEL 215, 220 with CODE (600a) Headlamp cleaning system

Function precondition:

Circuit 15 ON

Manual operation

The headlamp cleaning system (HCS) is switched on by pressing the HCS switch (S1s1).
This connects the corresponding input of the left front SAM control unit (N10/6), which reads in the signal of the HCS switch (S1s1), to ground.
The left front SAM control unit (N10/6) places the switch-on pulse onto the class B Controller Area Network bus (interior) (CAN-B) as a message.
The right front SAM control unit (N10/7) reads in this message and connects circuit 15 to the HCS pump (M5/2) for a switch-on time of approx. 1 s via an electronic switch (transistor).
The HCS pump (M5/2) builds up water pressure in the line.
The water pressure acts against the return springs in the telescopic nozzle.
Before the telescopic nozzles extend, spraying water on the headlamp lenses.
After expiration of the switch-on time, the pressure in the water line decreases and the telescopic nozzles are retracted to their initial position by the spring force.

Pressing the HCS switch (S1s1) again when a headlamp cleaning cycle is being performed has no effect.

Another headlamp cleaning cycle cannot be activated until the preceding one has completed.

Automatic operation (in vehicles as of 1.6.04)

After the windshield washer system has been operated 15 times the HCS pump (M5/2) is actuated automatically. This automatic control is performed by the right front SAM control unit (N10/7).

Function

For each actuation of the windshield washer fluid pump (M5/1) the internal counter in the right front SAM control unit (N10/7) is incremented by 1 until it reaches the value "15", then the HCS pump (M5/2) is actuated and the counter is reset to "0".

The internal counter is always reset to "0" with circuit 15 off.

	Headlamp cleaning system (HCS), location of components		GF82.15-P-0002-03S
	Headlight cleaning system (HCS) component network		GF82.15-P-0002-04S
	Telescopic nozzle for headlamp cleaning system, location/task/design/function		GF82.15-P-2100S
	Left signal acquisition and actuation module, location/task/design/function		GF54.21-P-4101S
	Right signal acquisition and actuation module, location/task/design/function		GF54.21-P-4102S