Mercedes-Benz ML320. Service manual - part 695

Fig. 137: Identifying Air Conditioning (Tempmatic) Socket Box Connection Diagram 

AIR CONDITIONING (TEMPMATIC) DIAGNOSIS PREVIOUS KNOWLEDGE - AD83.30-P-2000GH 

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

 

Air conditioning system, location of components

 

GF83.30-P-0003-
01GH

 Survey of electrical wiring diagrams for air conditioning

 

PE83.00-P-1100E

 

Connection and use of test equipment

 

AD00.00-P-1000AZ 

 

Notes on air conditioning (Tempmatic) (TAC) fault memory  

AD83.30-P-2000-
03GH

 

Pre-conditions for function check of air conditioning 
(Tempmatic) (TAC)

up to 
30.11.99

AD83.30-P-2000-
01GH

 

Pre-conditions for function check of air conditioning 
(Tempmatic) (TAC)

as of 
01.12.99

AD83.30-P-2000-
01GK

 

Variant coding, air conditioning (Tempmatic) (TAC)

 

AD83.30-P-2000-
02GH

 

Socket box connection diagram, air conditioning 
(Tempmatic) (TAC)

 

AD83.30-P-2000-
07GH

 

Air conditioning (Tempmatic) (TAC) diagnostic tools

 

AD83.30-P-2000-
04GH

 

Tools, testing electrical system of air conditioning 
(Tempmatic) (TAC)

 

AD83.30-P-2000-
06GH

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

AIR CONDITIONING (TEMPMATIC) DIAGNOSIS OPERATIONAL CHECK - AD83.30-P-3000GH 

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

 

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

 

AD83.30-P-2000GH

 

Function check 

 

 

Test step/Scope 
of test 

Operation/Requirement 

Specified value 

Possible cause/ Remedy 

1 

Temperature selector on "white 
zone" (

 ) function switch 

illuminated

Air from center level. AD83.30-P-6000-01GH

Air drying 

 

Air upwards.

AD83.30-P-6000-02GH

 

Air distribution switch at 12 o'clock A/C compressor ON .

AD83.30-P-6000-03GH 
AD83.30-P-6000-04GH 
AD83.30-P-6000-05GH 
AD83.30-P-6000-06GH 
AD83.30-P-6000-07GH 
AD83.30-P-6000-08GH 
AD83.30-P-6000-09GH

2 

Temperature selector on "white 
zone" 

 function switch 

illuminated

Air downwards and 
upwards.

AD83.30-P-6000-08GH

Normal setting 
in control mode 

 

A/C compressor ON . AD83.30-P-6000-09GH

 

Air distribution switch at 4 o'clock

Flow of temperature-
controlled air from 
center level as well. 
Coolant circulation 
pump runs.

 

3 

Temperature selector engaged on 
"blue" 

 function switch not 

illuminated

Air from center level 
(ambient air)

AD83.30-P-6000-08GH

Normal mode 
without heating 
mode 

 

A/C compressor OFF.  

 

Air distribution switch at 9 o'clock

 

 

4 

Temperature selector on "red" stop 

 function switch not 

illuminated

Heated air 
downwards, upwards 
and from center level.

AD83.30-P-6000-08GH

Normal mode in 
heating mode 

 

 

 

 

Air distribution switch at 4 o'clock

A/C compressor 
OFF. 

 

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

AIR CONDITIONING (TAU) DIAGNOSIS FUNCTION CHECK ACTUAL VALUES - AD83.30-P-3001GH 

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

5  
Recirculated air 
mode 

 function switch illuminated 

Blower switch on stage 4

Blower noise 
increases significantly



Cables  



Recirculated air 
switch  



Fresh 
air/recirculated air 
flap actuator motor  

 

Air conditioning (TAU) 
diagnosis previous 
knowledge

 

AD83.30-P-2000GH

 

Connect hand-held tester 
(HHT), read out 
diagnostic trouble code 
memory

Model 163 up to 31.8.01 AD00.00-P-2000-03C 

 

Operational check 

 

 

Test scope 

Operation / 
Requirement 

Specification 

Possible cause / Remedy 

01 
Circuit 30 

 

11-14 V



Wiring  



Battery  

02

Ignition ON 

Operating temperature 
approx. 80°C



Wiring  



Temperature sensor 
Coolant (B11/4)  



All-activity module 
(N10)  

Engine temperature 

Start engine and warm up 
to operating temperature.

03

Ignition ON 

Season-dependent, 
approx. 20° C



Wiring  



Temperature sensor 
Ambient air (B14)  



All-activity module 
(N10)  

Outside temperature 

04

Ignition ON 

ON



Wiring  



F1k21  



Blower motor (M2)  



All-activity module 
(N10)  

Blower power supply 
relay (F1k21) 

Blower stage 4

FROM

05

Ignition ON 

ON



Wiring  



F1k26  



Auxiliary fan (M4)  

Auxiliary fan relay 

FROM

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me 

 

AIR CONDITIONING (TAU) DIAGNOSTIC FAULT MEMORY - AD83.30-P-4000GH 

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

(F1k26) 



All-activity module 
(N10)  

08

Ignition ON 

ON



Wiring  



F1k19  



Heating water 
circulation pump 
(M13)  



All-activity module 
(N10)  

Heating water 
circulation pump relay 
(F1k19) 

FROM

09

Start engine

12 bar

AD83.30-P-6000-09GH

Refrigerant pressure 

 illuminates 

Blower stage 4

 

 

10

Start engine

ON

AD83.30-P-6000-08GH

A/C compressor (A9) 

 illuminates 

Blower stage 4

FROM



All-activity module 
(N10)  



A9  

11

Ignition ON 

YES



Wiring  



Control module Air 
conditioning (N19)  



All-activity module 
(N10)  

Air conditioning 
request 

 

NO

 

Air conditioning (TAU) 
diagnosis previous 
knowledge

 

AD83.30-P-
2000GH

 

Connect hand-held tester 
(HHT), read out 
diagnostic trouble code 
memory

Model 163 up to 31.8.01 

When a control module's fault memory is 

read out, all the faults stored in the control 
module are displayed, which means that 
fault codes that do not concern the system 
that is currently being read out can also 
appear.

AD00.00-P-
2000-03C 

 

Fault memory 

 

 

Fault code   

Possible cause 

Note 

Remedy 

(no 
communication 
with HHT 
possible)

Diagnostic cable

 

AD54.21-P-
6000-02GH 

 

2001 Mercedes-Benz ML320 

1998-2005 HVAC Climate Control - 163 Chassis

  

me