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8/14/2019 Climate Control M-Class
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1316 HO 163 Climate Control WJB
(10-25-01)
Climate Control
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These technical training materials are current as of the date noted on the materials, and may be revised or updated without notice. Always
check for revised or updated information.
To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer to the
latest Mercedes- Benz Technical Publication and follow all pertinent instructions when testing, diagnosing or making repair.Illustrations and descriptions in this training reference are based on preliminary information and may not correspond to the final US version
vehicles. Refer to the official introduction manual and WIS when available.
Copyright Mercedes- Benz USA, LLC, 2001
Reproduction by any means or by any information storage and retrieval system or translation in whole or part is not permitted without written
authorization from Mercedes- Benz USA, LLC or its successors.
Published by Mercedes- Benz USA, LLC
Printed in U. S.A.
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Additional rear vents
New for the 2002 M-Class Compressor with almost doubled capacity
Rear blower control unit with controls for air
direction and speed
AC controls with LED indication
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AAC Pushbutton Control Module
(N22)
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Blower Control Ring
Left control ring is used to
select 11 manuals speeds
The upper button selects front
defrost
The lower button selects therecirculation mode
To turn the system off turn the
fan dial to O .
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Temperature Control Ring Center Control Ring is
used to select the desired
temperature
Desired temperature can
be set in the AUTO
mode
The upper button can be
used to program the Auto
temperature
The lower button is used
to shut off the compressor
and to select the Rest
mode
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Air Distribution Control Ring
The right control ring is
used to select the front
manual air distribution
The upper button
activates the rear
defroster
The lower button is used
to turn off rear unit
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Rear Blower Control Unit
The left climate control button selects the rear fan speed The right button selects air distribution
The center Auto button allows the front control panel to select the fan
speed and air distribution
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Heating ModeCooling Mode
Air Distribution
Blend mode
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Air Distribution Groups
Main HVAC unit
Upper Instrument
Panel Ducting
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Rear Blower Unit Ducting
Consists of:
Ducting Rear blower motor
Rear blower motor
regulator
Rear temperaturesensor B10/7
Rear air flap motor
M2/21
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AAC Circuit Inputs
Temperature sensorsB10/6
B10/6 - Evap sensor
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B10/7
AAC Circuit Inputs
Temperature sensorsB10/6
B10/6 - Evap sensor
B10/7
B10/7 - Rear temp
sensor
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B10/7
AAC Circuit Inputs
Temperature sensorsB10/6
B10/6 - Evap sensor
B10/7
B10/7 - Rear temp
sensor
B10/24
B10/24 - Center nozzle
temp sensor
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B10/7
AAC Circuit Inputs
Temperature sensorsB10/6
B10/6 - Evap sensor
B10/7
B10/7 - Rear temp
sensor
B10/24
B10/24 - Center nozzle
temp sensor
B10/25
B10/25 - Front footwell
temp sensor
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B10/7
AAC Circuit Inputs
Temperature sensorsB10/6
B10/6 - Evap sensorB10/7
B10/7 - Rear tempsensor
B10/24
B10/24 - Center nozzle
temp sensor
B10/25
B10/25 - Front footwell
temp sensor
B32
B32 - Sun sensor
N22b1- In-car Temp
sensor
B14 - Ambient temp
sensor
N72/2 - Rear control
field module
N72 - Lower Control
Panel
B12/2 - Refrigerant pressure/temperature sensor
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AAC Outputs
A9 - Compressor
N29/2 - Rear Blower
regulator
A32 -
Recircultated air
unit
Electric actuators -
M2/5, 2/6, 2/8, 2/12,
2/15, 2/21
M13 - Auxiliary waterpump
M2/2 - Module box
blower motor
M2/2M13
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Electric Actuators
The electric actuators are the same
as those used on the 203 chassis
B+
Control
Ground
Coding pins
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Compressor Control
A1 - Instrument cluster B12/2 - Refrigerant pressure/temperature sensor
A9 - Compressor B14 - Outside temperature sensor
B10/6 - Evaporator sensor N22 - AAC pushbutton module
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Cooling Fan Control
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Acronyms/ abbreviations used in this program:
AC - Air Conditioning
A1 - Instrument Cluster
A9 - AC compressor
A32 - Recirculation air unit
B10/6 - Evaporator temperature sensorB10/7 - Rear temperature sensor
B10/24 - Center nozzle temperature sensor
B10/25 - Front footwell temperature sensor
B12/2 - Refrigerant pressure/temperature sensor
B14 - Outside temperature sensorB32 - Sun sensor
EVAP - evaporator
HVAC - Heat, Ventilation, Air Conditioning
LED - Light emitting diode
Ms - MotorsN22 - AC pushbutton control unit
N22b1 - In car temperature sensor
N29/2 - Rear blower regulator