Mercedes-Benz ML320. Manual — part 227

The actual frequency is also a factor of the vehicle's speed of travel (see chart below).

The wiper is turned off by reactivating the wiper/washer switch.

The start of each wipe cycle is synchronized with the front wiper system.

Networking

Rain sensor (B38) and reverse signals are fed to the All Activity Module (AAM) (N10) via the engine
compartment CAN.

The settings of the rear wiper/washer switch (S78) are read directly by the All Activity Module (AAM)
(N10) .

The tailgate wiper motor unit (M6/4) is controlled directly by the All Activity Module (AAM, N10) .

The tailgate wiper motor unit (M6/4) comprises a relay and a cam-operated switch in addition to the

actual motor.

WINDSHIELD INTERMITTENT WIPE, FUNCTION - GF82.30-P-3003GH

MODEL 163

Function sequence

The interval wiping function is switched on to position (i) with the combination switch.

The input (pin A8) of the all-activity module (AAM, N10) is connected to c. 15 R .

The AAM immediately actuates the front wiper motor relay (F1k17) for max. 2 s. In wiper stage 1 power is
supplied to the wiper motor (M6/1) by the relay (pin a).

Vehicle speed Under 50

km/h

Vehicle speed 50 to 100

km/h

Vehicle speed 100 km/h

and higher

Frequency of Rear wiper

One twelfth of front

wiper frequency

One tenth of front wiper

frequency

One sixth of front wiper

frequency

Rear Wiper/Washer Switch -
Location/Task/ Design/Function

GF82.30-P-
4105GH

All Activity Module -
Location/Task/Design/ Function

GF54.21-P-
4100GK

Tailgate Wiper Motor -
Location/Task/Design/ Function

GF82.30-P-
4105GH

Rain Sensor -
Location/Task/Design/Function

Vehicles with code
345a (rain sensor)
only

GF82.30-P-
4103GH

2001 Mercedes-Benz ML320

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

me

Power is supplied to the motor by the cam switch and non-actuated contact of the relay F1 k17 (pin b) until the
wiper arm has reached its park position. When the park position is reached the cam switch switches over. Then
the two motor connectors are short-circuited and the motor is braked by the eddy-currents.

Then the actual interval wiping starts. The described procedure is repeated for each interval.

Fig. 24: Identifying Windshield Intermittent Wipe Function

Interval actuation without code 345a (without rain sensor)

When the interval time is completed the AAM starts a new wiping procedure. The interval time is speed
dependent and is adjusted between 5 s when parked and 1 s at a speed of 180 km/h by the AAM.

Interval actuation as of 1.9.00 with code 345a (with rain sensor)

When c. 1 is ON: the rain sensor (B38) defines the wiping intervals .

The wiper motor relay (F1 k17) is actuated by the AAM at the intervals defined by the rain sensor (cf.
function sequence above). The relay switches off when c. 31 b (wiper not in park position) is recognized,
however, after 1 s (lock-up) at the latest.

In the event of heavy rain the relay remains actuated, the wiper operates as in stage 1.

Wiper motor,
location/purpose/design/function

GF82.30-P-
4104GH

Safety switch-off (WS), function

as of 1.9.2000

GF82.30-P-
3005GH

Anti-lock protection for wiper motor

GF82.30-P-
4008GH

All-activity module (AAM),
location/purpose/ design/function

up to 30.11.99

GF54.21-P-
4100GH

2001 Mercedes-Benz ML320

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

me

WIPER, FUNCTION - GF82.30-P-3004GH

MODEL 163

The function wiping windshield is switched in three stages with the combination switch (S4)



One-touch wiping - press switch lever upward to first catch position (t). The switch lever returns to the
basic position after being released.



Wiping stage 1 - press switch lever upward beyond first catch position (1).



Wiping stage 2 - press switch lever upward beyond second catch point (2).

A connector of the wiper motor (M6/1) is connected to circuit 15. The motor starts operating. When stage 2 is
switched on the other motor connection is switched. The motor operates with higher speed.

When switched back to the basic setting the motor is supplied with power by c. 15 via the non-actuated contact
of relay F1k17 (b) until the wiper arm has reached its park position. In this position, the cam switch brakes the
motor by short-circuiting (eddy-current brake)

Fig. 25: Identifying Wiper Function

as of 1.12.99

GF54.21-P-
4100GK

Rain sensor

only with code 345a
(rain sensor)

GF82.30-P-
4103GH

Anti-lock protection for wiper motor

GF82.30-P-
4008GH

Wiper motor,
location/purpose/design/function

GF82.30-P-
4104GH

All-activity module,

up to 30.11.99

GF54.21-P-

2001 Mercedes-Benz ML320

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

me

SAFETY SHUTOFF (WSA) - FUNCTION - GF82.30-P-3005GH

MODEL 163 Applicable as of 1.9.00

Safety shutoff

The intermittent wipe function is interrupted when the vehicle comes to a complete stop and at least one of
the front doors is open. Any wipe cycle in progress is completed before wipers come to a halt.

Wiping resumes when both front doors are closed and/or the vehicle is put into motion.

The safety shutoff therefore only operates when the vehicle is at a complete stop. This ensures that the

intermittent wiping feature remains available during driving even if a door jamb switch is defective.

ANTI-LOCK PROTECTION FOR WIPER MOTOR, FUNCTION - GF82.30-P-4008GH

MODEL 163

The all-activity module(AAM) (N10) recognizes that the wiper motor (M6/1) is locked up because of the
absence of signals from the cam switch.

If signals are not recognized for longer than 1 s the front wiper motor relay (F1k17) is no longer actuated.

The anti-lock protection is only effective in the function interval wiping . In other wiper stages the AAM does
not have influence on the wiper motor.

RAIN SENSOR - FUNCTION - GF82.30-P-4103-02GH

location/purpose/design/function

4100GH

as of 1.12.99

GF54.21-P-
4100GK

Extended activity module,
location/purpose

as of 1.12.99

GF54.21-P-
4106GH

Windshield Intermittent
Wipe - Function

GF82.30-P-3003GH

Wiper motor,
location/purpose/design/function

GF82.30-P-
4104GH

All-activity module (AAM),
location/purpose/ design/function

up to 30.11.99

GF54.21-P-
4100GH

as of 1.12.99

GF54.21-P-
4100GK

2001 Mercedes-Benz ML320

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

me