1997 MERCEDES-BENZ ML320 reset

Fig. 71: Identifying Refrigerant Circuit, Function (Model 163 As Of 1.9.01 With Code (580A) Automatic
Air Conditioning)
The refrigerant compressor driven by the motor compresses the gaseous refrigerant, which is thereby heated up
and routed to the condenser.
The refrigerant's compression heat is then withdrawn on the surface of the condenser. While cooling down, the
refrigerant liquefies.
When the refrigerant flows through the fluid reservoir it is cleansed of any chemical and mechanical impurities.
The water contained in the refrigerant is separated and collected.
The expansion valve sprays the cooled and liquefied refrigerant into the evaporator, which is located in the
fresh-air flow. Here the refrigerant is vaporized. Through this evaporation process heat is extracted from the
fresh air flowing past from outside over the tube and fin system so that air cools down.
The air humidity carried along is converted to condensed water, which escapes into the open. The air dries out.
The refrigerant compressor aspirates the refrigerant which has turned gaseous on account of the heat absorption
and then compresses it yet again.
When the engine is running and the blower switched on, the interior can be supplied with cooled air through the
various air outlets. Cooling intensity is dependent upon the preset in-car temperature and blower setting.
Engine 111.977, 112.942, 112.970

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:16 PMPage 87 © 2006 Mitchell Repair Information Company, LLC.

REST BUTTON, FUNCTION - GF83.40-P-2109-01GI
Function
Pressing the reset button ( ) on the AAC push-button control module (N22) switches on the residual engine
heat utilization system. When the engine is switched off, the residual heat heats the vehicle depending on the
temperature setting on the AAC push-button control panel (N22) and the ambient temperature in the vehicle
interior. The vehicle can be heated for approx. 30 min, with the engine switched off. The function is only
available with the ignition switched off or in position 1. If there is low voltage, the residual heat function is
automatically switched off.
The flaps are in automatic mode and the quantity of air is also automatically regulated.
The residual heat function is switched off,
if the electronic key is moved to position 2 in the starter switch,
after approx. 30 minutes,
if the battery voltage drops below 11V.
AUXILIARY FAN, FUNCTION - GF83.40-P-2115-01GH
Function
Depending on the refrigerant pressure and/or the coolant temperature the left auxiliary fan (M4m1), right
auxiliary fan (M4m2) are actuated.
The all-activity module (AAM) (N10) receives the coolant temperature from the coolant temperature sensor and
the refrigerant pressure from the refrigerant pressure sensor (B12).
The all-activity module (AAM) (N10) compares this input information with stored values and actuates the left
auxiliary fan (M4m1), right auxiliary fan (M4m2).
When the following values are indicated the left auxiliary fan (M4m1), right auxiliary fan (M4m2) are switched
on or off:
refrigerant pressure >16 bar = auxiliary fan ON
refrigerant pressure < 12 bar = auxiliary fan OFF
coolant temperature > 105°C = auxiliary fan ON
coolant temperature < 94°C = auxiliary fan OFF
AUXILIARY FAN, FUNCTION - GF83.40-P-2115-01GI
Function
Depending on the refrigerant pressure and/or the coolant temperature the left auxiliary fan (M4m1) and the right
auxiliary fan (M4m2) are actuated.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:16 PMPage 97 © 2006 Mitchell Repair Information Company, LLC.

AF54.30-P-8400A
Instrument cluster indicates: Oil sensor defective, oil level below min. or oil level

above max. with engine running and at operating temperature. No DTC stored.
19.5.98

MODEL
129.0, 163.1, 202.0, 208.3 /4, 210.0 /2 /6, 220.0 /1 with ENGINE 112

MODEL
129.0, 163.1, 202.0, 208.3 /4, 210.0 /2, 220.0 /1 with ENGINE 113

Damage code
Cause
Remedy

54 201 90
Oil low, connector defective or coding error
1
Shut off engine and wait 2 min. (key

position 0)

Instrument cluster indicates oil sensor

defective, oil level below min. or oil level

above max. with engine warm and running.

No DTC stored in DTC memory!

2
Check oil level with oil dipstick

3
Check oil level on instrument cluster:

- Key in steering wheel lock position 2,

engine not running

- Wait until - - - - - - appears on

instrument cluster

- When this is displayed press the reset

button for the tripodometer twice within

1 sec. (display appears only after

expiration of a waiting time (max. 30

min.) depending on engine oil

temperature)

Oil level is at bottom mark on oil dipstick

and instrument cluster indicates:
-1L
, -
1,5L
or -2L
#
4
Add quantity of oil indicated on

instrument cluster display and repeat

test.

Oil level at upper mark on dipstick and

instrument cluster indicates either oil level

okay or -1L
, -
1,5L
, -2L

#
5
Recode instrument cluster

AF54.30-P-8600A

Problem still present
#
6
Check cable to oil sensor, oil sensor
connectors, control module and fuse

box (see wiring diagram) for good contact

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9
Install inner cover (E) at 60 % bench

Insert cover past the springs from the rear

and rotate into position in a clockwise

direction. Insert locating tabs (19). Press the

front cover down and reset so that locating

tabs (20) engage. Press rear cover down until

locating tabs (18) engage.

10
Install outer cover (D) at 60 % bench

Guide the cover past the lateral curtain.

Insert locating tab (17), push front cover down

and reset so that locating tabs (16) engage.

Press the outer edge of the cover down and

insert lateral locating tabs (15). Raise rear
cover on the inside, press down until locating

tab (14) and rear locating tab (13) engage.

11
Install curtain at front 60 % bench

12
Install inner cover (C) at 40 % bench

Insert cover from the front and insert

locating tabs (11). Press the front cover down

and reset so that locating tabs (12) engage.

13
Install outer cover (B) at 40 % bench
Guide the cover past the lateral curtain.

Insert locating tab (10), push front cover down

and reset so that locating tab (9) engages.

Press the outer edge of the cover down and

insert lateral locating tabs (8). Insert locating

tab (7), push cover down at locating tab (6)

and engage.

14
Install curtain at front 40 % bench

15
Install rear cover (A)

Insert cover from the rear and press down

and forwards so that locating tabs (5) engage.

Press front ends of the cover down, so that

locating tabs (2, 3, 4) engage. Insert locating

tabs (1) into covers (C, E).

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5
Remove key and engage steering lock

6
Unscrew bolt (32c)

Hold the steering wheel (32).


Installation:
Replace bolt (32c).


*BA46.10-P-1001-02A

7
Pull off steering wheel (32)

Pass cables carefully through the openings.


Installation:
Align recesses of the splines

in the steering wheel with the markings on the

steering shaft (arrows).

8
Check fanfare horns and airbag clock spring

contact (A45) for damage

The clock spring contact must not be

turned while the steering wheel is removed

otherwise it will be damaged.

Visual inspection, replace clock spring

contact if necessary:

#

Removing and installing clock spring contact

AR46.10-P-0200GH

9
Install in the reverse order

10
Carry out road test

Tests during the road test:

Turn signal canceling:

When the steering wheel is offset by

more than 1 tooth, satisfactory resetting of the

turn signal is no longer guaranteed.

Airbag indicator lamp:

The SRS indicator lamp must not light up

on full steering lock in both directions.

Steering wheel position:

If the steering wheel is crooked, adjust it

by max. 1 tooth. If the difference is greater:

#

Check toe on front axle and adjust if

necessary, see:

#

Performing chassis alignment check

AR40.20-P-0200A

Steering wheel

Number

Designation
Model 163

BA46.10-P-1001-02A
Bolt, steering wheel to steering shaft
Nm
80

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GF54.50-P-4100-02GH
Trip computer control module, design

n

The trip computer control module (TRIP, N41) consists of the

following components:
D
Electronics unit

D
LCD display

D
Reset button (left button, N41s1)

D
Mode button (right button, N41s2)

D
Inclination sensor (N41b1)
D

Glass breakage sensor (N41b2)

D
CAN interface

D
Alarm bus to all activity module (AAM, N10)

D
as of 1.9.00: Interface (RS 485) to electronic compass (B26)

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GF54.50-P-4100-02GH
Trip computer control module, design

n

The trip computer control module (TRIP, N41) consists of the

following components:
D
Electronics unit

D
LCD display

D
Reset button (left button, N41s1)

D
Mode button (right button, N41s2)

D
Inclination sensor (N41b1)
D

Glass breakage sensor (N41b2)

D
CAN interface

D
Alarm bus to all activity module (AAM, N10)

D
as of 1.9.00: Interface (RS 485) to electronic compass (B26)

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AR20.40-P-5660C
Remove/install viscous fan clutch
12.6.96

ENGINE
112 in MODEL 210, 202, 163.154 /157, 129

ENGINE
113 in MODEL 210, 208, 202, 163.172, 129

ENGINE
112.945 in MODEL 463.209 /232 /233 /244 /245 /250

ENGINE
113.962 in MODEL 463.206 /240 /241 /247 /248 /249 /254

ENGINE
113.982 in MODEL 463.243 /246

P20.40-0237-06

Shown on Engine 112

1
Counterholder

2
Belt pulley

3
Viscous fan

4
Torque wrench

5
Open-end wrench bit


Remove/Install

1
Fit counterholder (1) on bolts of belt pulley

(2), counterhold

Belt pulley of coolant pump


*113589004000

2
Unscrew union nut at visocus fan (3)

Right-hand thread.


Installation:
Use torque wrench with

open-end wrench bit.


*BA20.40-P-1002-01B


*113589000100

3
Unbolt fan at viscous clutch


Installation:
The installation position of

the fan is preset through cast-on ribs at fan

ring.


*BA20.40-P-1001-01B

4
Install in the reverse order


Fan, fan clutch

Number

Designation
Engine

112.910/911/912/
913/914/915/
916/917/920/
921/922/923/
940/941/942/
943/944/945/
946/947/949/
951/953/954/
955/960/961/

970/972/973/975
Engine

113

BA20.40-P-1001-01B
Fan to viscous clutch
Nm
1010

BA20.40-P-1002-01B
Viscous clutch to bearing body
Nm
4545

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Page 1