1997 MERCEDES-BENZ ML350 sensor

Fig. 132: Locating In-Car Temperature Sensor With Aspirator Nozzle
1. Check condition of fuses F16, F41, F43, F44.
2. Check aspirator nozzle for in-car temperature sensor as follows: With ignition switched on, place a piece
of paper (arrow) of 1cm surface area on grill in front of in-car temperature sensor with aspirator nozzle
(B10/4). With sufficient ventil ation (aspirator nozzle to blow er), paper remains on grill.
3. Allow engine to idle at operating temperature (engine coolant temperature approx. 80°C) during the
complete duration of the test.
4. Outside temperature > 15°C.
5. Open center and side air outlets manually.
6. Recirculated air switch not pressed.
7. Set blower switch to stage 4.
AIR CONDITIONING (TEMPMATIC ) PRECONDITIONS FOR OPERATIONAL CHECK - AD83.30-P-2000-01GK
as of 1.12.99

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

Fig. 133: Locating In-Car Temperature Sensor With Aspirator Blower
1. Check status of fuses F16, F41, F43, F44.
2. Check aspirator blower for in-car temperature sensor: With ignition switched on, place a piece of paper
(arrow) of 1cm surface area on grill in front of in-car temperature sensor (B10/4) with aspirator blower.
With sufficient ventilation (a spirator blower to blower), paper remains on grill.
3. Allow engine to idle for entire duration of test at operating temperature (approx. 80°C coolant
temperature).
4. Outside temperature > 15°C
5. Open center and side nozzles manually.
6. Recirculating air sw itch not pressed.
7. Blower switch on step 1.
Observe run-on time.
AIR CONDITIONING (T EMPMATIC) VERSION CO DING - AD83.30-P-2000-02GH
Variant coding is carried out by the HHT and is menu -assisted. Communication is possible as soon as the
ignition key is inserted in the ignition lock (the igniti on lock position is not important). Variant coding (position
1) is reached from the main menu via control module adaptations (position 5). The following two options are
available in variant coding:
1. Read out coding and transfer to new control module.
2. Readout/change coding.
Position 2 must be selected in order to read out th e air conditioning coding. The air conditioning variant coding
is found under position 07 in the following listing.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 164 © 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 (TEMPMAT IC) TEST OF ELECTRICAL SYSTEM CIRCUIT 15 VOLTAGE SUPPLY - AD83.30-P-6000-
01GH
Fig. 138: Air Conditioning (Tem pmatic) Test Of Electrical System Circuit 15 Voltage Supply
AIR CONDITIONING (TEM PMATIC) TEST OF ELECTRICAL SYST EM CIRCUIT 31 GND - AD83.30-P-6000-02GH
Fig. 139: Air Conditioning (Tempmatic) Test Of Electrical System Circuit 31 GND
AIR CONDITIONING (TEMPM ATIC) TEST OF ELECTRICAL SYSTEM IN-CAR TEMPERA TURE SENSOR - AD83.30-P-
6000-03GH
Fig. 140: Air Conditioning (Tempmat ic) Test Of Electrical System In-Car Temperature Sensor
AIR CONDITIONING (TEMPMATIC) TEST OF ELECTRICAL SYSTEM ANTI-ICING TEM PERATURE SENSOR - AD83.30-
P-6000-04GH
No fault codeNo fault detectedIf there is a complaint in spite of this ?
Air conditioning (TAU) electrical system
testingAD83.30-P-
6000GH
B1232Refrigerant compressor
sensor (B12) AD83.30-P-
6000-09GH
B1419Electromagnetic clutch
(A9k1) Wiring
A9k1

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 171 © 2006 Mitchell Repair Information Company, LLC.

Fig. 141: Air Conditioning (Tempmatic ) Test Of Electrical System Anti-Icing Temperature Sensor
AIR CONDITIONING (TEMPMATIC) TEST OF ELECTRICAL SYSTEM TEMPERATURE SELECTOR CONTROL
VOLTAGE - AD 83.30-P-6000-05GH
Fig. 142: Air Conditioning (Tempmat ic) Test Of Electrical System Temperature Selector Control Voltage
AIR CONDITIONING (TEMPMATIC) TEST OF ELECTRICAL SYSTEM BLENDING AIR FLAP SERVO MOTOR
CONTROL VOLTAGE - AD83.30-P-6000-06GH
Fig. 143: Air Conditioning (Tempmat ic) Test Of Electrical System Blending Air Flap Servo Motor
Control Voltage
AIR CONDITIONING (TEMPMATIC) TEST OF ELECTRICAL SYSTEM BLENDING AIR FLAP SERVO MOTOR GND -
AD83.30-P-6000-07GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 172 © 2006 Mitchell Repair Information Company, LLC.

Fig. 144: Air Conditioning (Tempmat ic) Test Of Electrical System Blending Air Flap Servo Motor GND
AIR CONDITIONING (TEMPMATIC) TEST OF ELECTRICAL SYSTEM REFRIGERANT COMPRESSOR ACTUATION -
AD83.30-P-6000-08GH
Fig. 145: Air Conditioning (Tempmat ic) Test Of Electrical System Refrigerant Compressor Actuation
AIR CONDITIONING (TEMPM ATIC) TEST OF ELECTRICAL SYSTEM REFRIGERANT PR ESSURE SENSOR - AD83.30-P-
6000-09GH
Fig. 146: Air Conditioning (Tempm atic) Test Of Electrical System Refrigerant Pressure Sensor
OUTSIDE AIR TEMPERATURE SENSOR, TESTING EL ECTRICAL SYSTEM OF TAC - AD83.30-P-6000-24GH
as of 1.12.99

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 173 © 2006 Mitchell Repair Information Company, LLC.

Fig. 147: Outside Air Temperature Sensor, Testing Electrical System Of TAC
AIR CONDITIONING (TEMPMATIC) ELECTRICAL SYSTEM TESTING - AD83.30-P-6000GH
MODEL 163 with CODE (580) Air conditioning or Tempmatic for USA
Air conditioning component
arrangement GF83.30-P-
0003-01GH
Overview of climate control wiring
diagrams PE83.00-P-
1100E
Connect hand-held tester (HHT), read
out diagnostic trouble code memoryModel 163 up to 31.8.01
Erase fault memory in control module
(N19) using HHT when testing is completeAD00.00-P-
2000-03C
Air conditioning (Tempmatic)
diagnosis previous knowledge AD83.30-P-
2000GH
Air conditioning (Tempmatic)
diagnosis function check The testing of the fresh air/recirculated
air flap actuator motor (M39) is carried out
during the function checkAD83.30-P-
3000GH
Testing
1
Circuit 15 power supply, air
conditioning (Tempmatic) electrical
system testing
AD83.30-P-
6000-01GH
2Circuit 31 ground, air conditioning
(Tempmatic) electrical system testing AD83.30-P-
6000-02GH
3
In-car temperature sensor, air
conditioning (Tempmatic) electrical
system testing
AD83.30-P-
6000-03GH
4
Anti-icing protection temperature
sensor, air conditioning (Tempmatic)
electrical system testing
AD83.30-P-
6000-04GH
5
Temperature selector wheel control
voltage Air conditioning (Tempmatic)
electrical system testing
AD83.30-P-
6000-05GH
6
Blending air flap servo motor control
voltage, air conditioning (Tempmatic)
electrical system testing
AD83.30-P-
6000-06GH
7Blending air flap actuator motor
ground, air conditioning (Tempmatic) AD83.30-P-

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 174 © 2006 Mitchell Repair Information Company, LLC.

TESTING & REPAIR
TESTING AND REPAIR WORK: PASSENGER CARS: CLIMATE CONTROL - AR83.00-Z-9163AA
MODEL 163
electrical system testing6000-07GH
8
Refrigerant compressor actuation, air
conditioning (Tempmatic) electrical
system testing
AD83.30-P-
6000-08GH
9
Refrigerant pressure sensor, air
conditioning (Tempmatic) electrical
system testing
AD83.30-P-
6000-09GH
10
Ambient temperature sensor, air
conditioning (Tempmatic) electrical
system testing
as of 01.12.99AD83.30-P-
6000-24GH
Remove/install center outlet flap
actuator motorMODEL 163...AR83.10-P-
2019GH
Removing and installing rear air
nozzleMODEL 163.113/154 /174 #A as of 289565, 163.113 #X
as of 754620, 163.128 /157 /175AR83.10-P-
4800GH
Remove, install switch unit for
heater/ ventilationMODELS 163.113/136/154/172/174 up to 31.8.01 with
CODE (580) air conditioning or Tempmatic for USAAR83.20-P-
1835GH
Remove and install heat
exchanger from heater housingMODEL 163AR83.20-P-
3400GH
Replace bulbs in push-button
control moduleMODELS 163.113/154/174/136/172 up to 31.8.01AR83.25-P-
1123GH
Remove and install series
resistor for heater blowerMODEL 163.113/128 /136 /154 /157 /172 /174 /175AR83.25-P-
1250GH
Remove/install cover at air
intakeMODEL 163.113/128 /136 /154 /157 /172 /174 /175AR83.25-P-
1405GH
Carry out quick test on air
conditioning systemMODEL 163, 901, 902, 903, 904 ...AR83.30-
D-1209A

Draining, evacuating and
refilling air conditioning,
checking function and checking
for leaks
MODEL 163...AR83.30-P-
1760GH

Remove/install defroster vent
flap actuator motor for
windshieldMODEL 163.113/154 /174 #A as of 289565, 163.113 #X
as of 754620, 163.128 /157 /175AR83.30-P-
2006GH
Remove/install footwell flap
actuator motorMODEL 163...AR83.30-P-
2007GH
Remove/install rear shutoff flap
actuator motorMODEL 163.113/154 /174 #A as of 289565, 163.113 #X
as of 754620, 163.128 /157 /175AR83.30-P-
2008GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 175 © 2006 Mitchell Repair Information Company, LLC.