1997 MERCEDES-BENZ ML430 wiring

Fig. 12: Automatic A/C-Heater Systems Wiring Diagram (2000-01 ML 320 & ML 430 With Cooling Fan
Control Module - 1 Of 2)

2001 Mercedes-Benz ML320
2000-01 MANUAL A/C-HEATER SYSTEMS ML 320, ML 430 & ML 55
me
Saturday, October 02, 2010 3:25:10 PMPage 31 © 2006 Mitchell Repair Information Company, LLC.

Fig. 13: Automatic A/C-Heater Systems Wiring Diagram (2000-01 ML 320 & ML 430 With Cooling Fan
Control Module - 2 Of 2)

2001 Mercedes-Benz ML320
2000-01 MANUAL A/C-HEATER SYSTEMS ML 320, ML 430 & ML 55
me
Saturday, October 02, 2010 3:25:10 PMPage 33 © 2006 Mitchell Repair Information Company, LLC.

Parts ordering notes
INSUFFICIENT AIR CONDITIONING DURING IDLING - AF83.30-P-6007A
MODEL 163.154 #A up to 289564, 163.154 #X, 163.136 /172 with CODE (580) Air conditioning or
Tempmatic for USA
Modification notes
Operation no. of operation texts or standard texts and flat rates
Damage
codeCauseRemedy
83 751
Pressure sensor (B12) occasionally indicates wrong
pressure value to control and operating module
(N19/22) (depending on temperature).
1 Connect pressure gauge and HHT.

Air conditioning/automatic air conditioning
occasionally does not function, refrigerant
compressor does not run.2 Call up air conditioning actual values
with HHT.

3 Compare refrigerant pressure
between pressure gauge (high pressure
side) and HHT.


If pressure difference is greater than
2 bars.?
4 Remove/install/replace pressure
sensor on receiver/drier.

Part no.DesignationQuantity
140 830 00 72Pressure sensorAs required
21.6.04Work steps 1-2 erased
CategoryOp.
no.Operation textTimeAcc.
no.Code
P023731Install modified wiring harness for auxiliary fan (after
checking)015
WU--
Damage
codeCauseRemedy
50 041 73
Fuse f44 blows due to
repeated switch-on of
additional fan
1 Check whether service auxiliary wiring harness (2)
for additional fan has already been installed
The original additional fan connector (M4x1) is
already fastened next to the new additional fan
connector (3) with adhesive tape.


If auxiliary wiring harness (2) is already
installed: ?
2 Ensure that a 40 A fuse is located at position f44


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 156 © 2006 Mitchell Repair Information Company, LLC.

Fig. 130: Identifying Fuse And Relay Module, Additional Fan Connector And Plug Connector, Blue
NO REFRIGERATION/HEAT FROM AUTOMATIC AIR CONDITIONER - AF83.40-P-3400A
MODEL 163.### #A as of 289565 up to 458809, 163.### #X as of 754620 up to 777100
Operation no. of operation texts or standard texts and flat rates
If an auxiliary wiring harness (2) has not yet been
installed: ?
3 Install auxiliary wiring harness.SM83.30-P-
0009GH

If an additional wiring harness and a 40 A fuse are
already installed and the auxiliary fan does not
function: ?
4 Perform corresponding diagnosis and repair.

CategoryOp. no.Operation textTimeAcc. no.Code
P831917Replace air conditioning operating unit014 WU--
Damage
codeCauseRemedy
83 491 90The air mixing flap is not actuated by the AAC [KLA]
control and operating unit (N22) because the voltage in
the vehicle electrical system is too low during cold start.
1 Replace AAC [KLA]
control and operating
AR83.40-P-

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 157 © 2006 Mitchell Repair Information Company, LLC.

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-1002-08ADigital temperature measuring instrument (measuring range -20° to +70°)
WH58.30-Z-1004-08AAir 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
Saturday, October 02, 2010 3:23:17 PMPage 160 © 2006 Mitchell Repair Information Company, LLC.

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
30.11.99AD83.30-P-2000-
01GH
Pre-conditions for function check of air conditioning
(Tempmatic) (TAC)as of
01.12.99AD83.30-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
Saturday, October 02, 2010 3:23:17 PMPage 167 © 2006 Mitchell Repair Information Company, LLC.

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 4Blower 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
memoryModel 163 up to 31.8.01AD00.00-P-2000-03C
Operational check
Test scope Operation /
Requirement Specification Possible cause / Remedy
01
Circuit 30 11-14 VWiring
Battery
02Ignition 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.
03Ignition ON Season-dependent,
approx. 20° CWiring
Temperature sensor
Ambient air (B14)
All-activity module
(N10)
Outside temperature
04Ignition ON ONWiring
F1k21
Blower motor (M2)
All-activity module
(N10)
Blower power supply
relay (F1k21) Blower stage 4FROM
05Ignition ON ONWiring
F1k26
Auxiliary fan (M4) Auxiliary fan relay FROM

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 169 © 2006 Mitchell Repair Information Company, LLC.

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)
08Ignition ON ONWiring
F1k19
Heating water
circulation pump
(M13)
All-activity module
(N10)
Heating water
circulation pump relay
(F1k19) FROM
09Start engine12 barAD83.30-P-6000-09GH
Refrigerant pressure illuminates
Blower stage 4
10Start engineONAD83.30-P-6000-08GH
A/C compressor (A9) illuminates
Blower stage 4FROMAll-activity module
(N10)
A9
11Ignition 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
Saturday, October 02, 2010 3:23:17 PMPage 170 © 2006 Mitchell Repair Information Company, LLC.