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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