Rear window wiper system, function - GF82.30-P-2200MCU

MODEL 451.3

Fig 1: Rear Window Wiper System Function Chart

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function requirements:

Circuit 15 On

Functions

Intermittent wipe
Wiping with washer fluid
Automatic wiping when reverse gear engaged

Intermittent wiping

Rear window intermittent wiping is activated by pushing the wiper switch forwards past the detent point. The request is read in by the SAM control unit, which actuates the wiper motor directly. Wiper arm park position feedback is provided by the signal contact that is integrated in the rear-end door wiper motor.

Wiping with washer fluid

The window washer fluid pump is actuated directly by pushing the wiper switch forwards and holding it in position. At the same time, the SAM control unit actuates the rear-end door wiper motor with a time delay of approx. 0.2 s. Three additional wiping cycles are performed after the wiper switch has been released.

Automatic wiping when reverse gear is engaged

If the windshield wiper system is active and the outside temperature is above 5°C, the rear-end door wiper motor is actuated automatically by the SAM control unit for one wiping cycle when the reverse gear is engaged.

Instrument cluster, component description	A1	GF54.30-P-6000MCU
Windshield washer fluid pump, component description	M5/1	GF82.35-P-5000MCC
Rear-end door wiper motor, component description	M6/4 in case of model 451.3	GF82.30-P-5020MCC
SAM control unit, component description	N10/10	GF54.21-P-4157MCU
Automated manual transmission control unit, component description	N15/6	GF26.19-P-1010MCU
Wiper switch, component description	S4/4	GF82.30-P-5002MCC