Headlamp cleaning system (HCS), function - GF82.15-P-0002R: Notes
MODEL 230 with CODE (600a) Headlamp cleaning system
Function prerequisites:
- 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 driver-side SAM control unit (N10/10), which reads in the signal of the HCS switch (S1s1), to ground.
- The driver-side SAM control unit (N10/10) places the switch-on pulse onto the class B Controller Area Network bus (interior) (CAN-B) as a message.
- The passenger-side SAM control unit (N10/11) reads 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 front passenger SAM control unit (N10/11).
Function
For each actuation of the windshield washer fluid pump (M5/1) the internal counter in the front passenger SAM control unit (N10/11) 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-0002-03R | ||
| Headlight cleaning system (HCS) component network | GF82.15-P-0002-04R | ||
| Telescopic nozzle for headlamp cleaning system, location/task/design/function | GF82.15-P-2100R | ||
| Driver-side SAM control unit with fuse and relay module, location/task/design | GF54.21-P-4109R | ||
| Passenger-side SAM control unit with fuse and relay module, location/task/design | GF54.21-P-4111R |