Mercedes-Benz ML320. Manual — part 693

Commercially available tools

Parts ordering notes

SELF-DIAGNOSTIC SYSTEM

HEATER, DIAGNOSIS, CONTENTS - AD83.20-P-1000GHZ

MODEL 163

DIAGNOSIS TOOLS, HEATER - AD83.20-P-2000-01GC

Commercially available tools

If the actual value changes, there are not faults

present in the automatic air conditioning control
unit.
6 Perform further diagnosis and repair
correspondingly.

If actual value remains unchanged: ?

7 Remove/install/replace automatic air
conditioning control unit.

AR83.40-P-
6500GH

8 Install components removed in opposite order.

9 Select "Control module adaptation" with STAR
DIAGNOSIS under "Automatic air conditioning".

10 Select "Read coding and change if necessary".

11 Adjust "National version" according to
customer's request

Settings for blower and temperature: ?

"Rest of the world". = Minimum
"USA" = Standard
"----" = Maximum

12 Adjust "LED dimming" according to "SERIES"

13 Adjust further coding according to vehicle
specifications.

Number

Designation

WH58.30-Z-1048-13A STAR DIAGNOSIS diagnosis system, Compact Passenger Car

6511 1801 00

Part no.

Designation

Quantity

163 820 49 89

Switch unit/automatic air conditioning control unit, ECE

1

163 820 50 89

Switch unit/automatic air conditioning control unit, USA

1

K 1.8 [] 11

Heater, diagnosis, basic knowledge

AD83.20-P-2000GH

K 1.8 [] 12

Heater, diagnosis, function check

AD83.20-P-3000GH

Number

Designation

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

HEATER, DIAGNOSIS, BASIC KNOWLEDGE - AD83.20-P-2000GH

MODEL 163

HEATER CAPACITY, FUNCTION CHECK, HEATER - AD83.20-P-3000-01GH

Test sequence



Heater switch (2) on "red" stop



Blower switch (1) on stage 4



Air distribution switch (3) in 12 o'clock position



Recirculated air button (

) not pressed (LED does not come on)



Test period > 5 minutes



Engine speed 2000 rpm



Engine coolant temperature > 80°C



Read out temperature measuring instrument (4)

Temperature display > 55°C

If the measured values stated above are not achieved, the following components and functions should be
checked:



Engine coolant temperature



Furring in cooling system and heat exchanger



Blend air flap function



Coolant circulation pump (M13)

WH58.30-Z-1002-08A

Digital temperature measuring instrument (measuring range -20° to +70°)

WH58.30-Z-1004-08A

Air temperature probe

Electric wiring diagrams, location of ground points and connectors

PE83.00-P-1100E

Connection and use of test equipment

AD00.00-P-1000AZ

Diagnosis tools, heater

AD83.20-P-2000-01GC

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Fig. 131: Identifying Heater Capacity, Function Check, Heater

HEATER, DIAGNOSIS, FUNCTION CHECK - AD83.20-P-3000GH

MODEL 163

Heater, diagnosis, basic knowledge

AD83.20-P-2000GH

Check fuses F1/6, F1/41, F1/43

Allow engine to idle at operating
temperature (approx. 80°C engine coolant
temperature) throughout the entire test
period

Outside temperature > 15°C

Open center and side air outlets manually

Recirculated air button (

) is not

pressed (LED does not come on)

Blower switch on stage 4

Function check

Test
step/Scope of
test

Operation/Requirement

Specified value

Possible cause/ Remedy

1
No heat

Heater switch on "blue" stop

Air outlets,
unheated air



Wire cable for
actuating blend air
flap

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

AIR CONDITIONING (TEMPMATIC) DIAGNOSIS CONTENTS - AD83.30-P-1000GHZ

MODEL 163 with CODE (580) Air conditioning or for USA, Tempmatic

AIR CONDITIONING (TEMPMATIC) PRECONDITIONS FOR OPERATIONAL CHECK - AD83.30-P-2000-01GH

up to 30.11.99



Heater push-button
unit

2
Full heat

Heater switch on "red" stop

Air outlets, heated
air



Wire cable for
actuating air blend
flap



Heater push-button
unit

3
Recirculated
air mode

Heater switch in any position Recirculated
air button (

) is pressed (LED comes

on)

Air flow from
center outlet
increases
noticeably



Cables



Recirculated air
button



Actuator motor for
recirculated air flap
element (M39)



Heater push-button
unit

4
Heat output

Connect temperature measuring instrument
Heater switch on "red" stop

Air outlet
temperature at
defroster outlet >
55°C



Engine coolant
temperature



Hot water coolant
circulation pump



Furring in cooling
system and heat
exchanger

Test sequence

AD83.20-P-3000-01GH

K 2.6 [] 11

Air conditioning (Tempmatic) (Tempmatic A/C) diagnosis, previous
knowledge

AD83.30-P-
2000GH

K 2.6 [] 12

Air conditioning (Tempmatic) (Tempmatic A/C) diagnosis, function
check

AD83.30-P-
3000GH

K 2.6 [] 13

Air conditioning (Tempmatic) (Tempmatic A/C) diagnosis, function
check actual values

AD83.30-P-
3001GH

K 2.6 []
14A

Air conditioning (Tempmatic) (Tempmatic A/C) diagnosis, fault memory

AD83.30-P-
4000GH

K 2.6 [] 21

Air conditioning (Tempmatic) (Tempmatic A/C), testing electrical
system

AD83.30-P-
6000GH

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me