Automatic wiper control function - GF82.30-P-3009SK

MODEL 171.4 with CODE (345a) Rain sensor

Fig 1: Automatic Wiper Control Function Chart

Courtesy of MERCEDES-BENZ USA

Function prerequisite

Circuit 15R ON

Function

The automatic wiper control (rain sensor operation) function is switched on by turning the combination switch (S4) to position "I". The wiper motor (M6/1) is actuated depending on:

Ambient light conditions
Degree of windshield wetting
The vehicle speed
Outside temperature

The rain/light sensor (B38/2) and the overhead control panel control unit (N70) evaluate the signals. The wiper motor (M6/1) is actuated via the Controller Area Network Bus Class B (interior) (CAN-B) (CAN) by the driver-side SAM control unit with fuse and relay module (N10/1).

Possible wiper levels:

Intermittent wiper with variable intervals.
Continuous wiping at the required wiping speed.

Emergency running

If the communication between the rain/light sensor (B38/2) and the overhead control panel control unit (N70) fails, intermittent operation is activated at fixed intervals (approx. 5 sec.).

If automatic speed reduction is active the interval is approx. 7.5 sec.

Slowing down wiper motor, function	GF82.30-P-4007SK
Anti-block device for wiper motor, function	GF82.30-P-4008SK
Rain/light sensor location/task/function	GF54.21-P-4123SK
Driver-side SAM control unit with fuse and relay module, location/task/design	GF54.21-P-4109SK
Steering column module location/task	GF54.21-P-4125SK
Electronic ignition switch control unit, location/purpose	GF80.57-P-4120SK
Overhead control panel control unit, location/ task/design	GF82.20-P-4110SK
Combination switch location/task	GF82.30-P-2101SK
Wiper motor location/task	GF82.30-P-4107SK
Outside temperature sensor, location/task/ function	GF83.57-P-2110SK