Mercedes-Benz ML320. Service manual - part 228

 

  Index      Mercedes     Mercedes-Benz ML320 - service and repair manual 1997-2005 year

 

Search            copyright infringement  

 

 

 

 

 

 

 



 

 

Content   ..  226  227  228  229   ..

 

 

Mercedes-Benz ML320. Service manual - part 228

 

 

How it works  

An infrared transmitter (2)sends infrared light to a lens (1) which directs the beam to the windshield (4) . The 
intensity of the light reflected by the windshield is measured by an IR receiver (3)located at the opposite end of 
the lens. 

Dry windshield (Fig. A) 

When the area around the rain sensor (B38) is dry nearly all of the light is reflected and the IR receiver 
(3) measures a high level of light intensity. 

Wet windshield (Fig. B) 

When the reflection area is wet, some of the light is scattered away from the glass of the windshield. This 
reduces the intensity of the reflected light and the IR receiver (3) measures a lower level of light intensity.

The light intensity measured by the IR receiver (3) provides a measure of the rain intensity on the windshield. 
Lower light intensities indicate higher levels of rain intensity on the windshield. 

Fig. 26: Identifying Infrared Transmitter And IR Receiver 

Rain sensor data flow  

The rain sensor (B38) networks with the All Activity Module (AAM, N10) via the engine compartment CAN. 

 More than just a "rain sensor," the unit also comprises integrated light sensors for the vehicle lighting 

 

2001 Mercedes-Benz ML320 

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

  

me 

 

system . Data from the light sensors is also sent to the All Activity Module (AAM, N10) via the engine 
compartment CAN. 

 Power supply  

Power is supplied to the rain sensor (B38) via KI. 15 so that these functions are available only when the ignition 
is on. 

RAIN SENSOR - LOCATION/TASK/DESIGN/FUNCTION - GF82.30-P-4103GH 

MODEL 163 with code 345a Rain sensor  

Fig. 27: Identifying Rain Sensor Location 

 

Rain Sensor - Location

The rain sensor (B38) is 
adhered to the inside 
surface of the windshield.

 

 

Rain Sensor - Task

The rain sensor (B38) 
assesses the rain 
intensity
 on the 
windshield and 
automatically adjusts the 
intermittent wiper speed. 
In addition, light sensors 
gauge ambient light 

 

 

2001 Mercedes-Benz ML320 

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

  

me 

 

WIPER MOTOR, FUNCTION - GF82.30-P-4104-01GH 

The wiper arm can be driven by the motor with two speeds. The motor runs at high or low speed depending on 
brush voltage present. 

The cam switch switches circuit 31b from circuit 15 to circuit 31 when the windshield wiper runs through the 
park position. 

WIPER MOTOR, DESIGN - GF82.30-P-4104-02GH 

The windshield wiper is driven by the wiper motor (M6/1) , an electric motor with three brushes and gear. The 
cam switch is located on the output shaft. 

Fig. 28: Identifying Wiper Motor 

WIPER MOTOR, LOCATION/PURPOSE/DESIGN/FUNCTION - GF82.30-P-4104GH 

MODEL 163  

conditions and this data 
is used to control the 
vehicle's light system.

 

Rain Sensor - Design

The rain sensor (B38) 
comprises an IR 
transmitter and receiver 
unit, light sensors 
and an 
electronic data analysis 
and interface circuit. The 
rain sensor (B38) is 
connected to the engine 
compartment CAN
 .

 

 

Rain Sensor - Function

 

GF82.30-P-4103-02GH

 

2001 Mercedes-Benz ML320 

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

  

me 

 

REAR WIPER/WASHER SWITCH - FUNCTION - GF82.30-P-4105-01GH 

The rear intermittent wipe function is started by placing the rear wiper/washer switch (S78) in the up position. 
The switching contact connects the input (c) to the All Activity Module (AAM, N10) to terminal 15 (a). 

The rear wash function is started by placing the switch in the down position. Power is fed to the tailgate 
washer pump (M5/3)
 (b) from terminal 15 via the second switch contact and the AAM input (c) is 
simultaneously connected to terminal 15 via the resistor (R). 

As of 1.9.2000:  

When the rear intermittent wipe function is activated manually the LED built into the rear wiper/ washer switch 
(S78) will illuminate. LED illumination is controlled by the All Activity Module (AAM, N10) . 

Fig. 29: Identifying Rear Wiper/Washer Switch Function 

REAR WIPER/WASHER SWITCH - LOCATION/TASK/DESIGN/FUNCTION - GF82.30-P-4105GH 

MODEL 163  

 

Wiper motor, location

 

GF82.30-P-0005-01GH

 

Wiper motor, purpose

Wiper motor drive for 
windshield.

 

 

Wiper motor, design

 

GF82.30-P-4104-02GH

 

Wiper motor, function

 

GF82.30-P-4104-01GH

 

Location

 

GF82.30-P-0004-01GH

 

Task

To control the rear 
intermittent wipe and rear 
wash functions 
Starting 1.9.2000 this 
switch will also include 
an ON/OFF indicator 
LED for the rear wiper.

 

 

Design

The rear wiper switch 
consists of a push-button 

 

 

2001 Mercedes-Benz ML320 

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

Content   ..  226  227  228  229   ..