316 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 MercedesMercedes- Benz Technical Technical Publication Publication and follow all pertinent instructions instructions when testing, diagnosing 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. Copyrigh Copyrightt MercedesMercedes- Benz USA, USA, LLC, LLC, 2001 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 authorization from Mercedes- Benz USA, USA, LLC or its successors. successors.  Publish  Published ed by Merced Mercedeses- Benz USA, LLC   Printed in U. S.A. 2

New for the 2002 M-Class • Compressor with almost doubled capacity • AC controls with LED indication • Rear blower control unit with controls for air  direction and speed

• Additional rear vents 3

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 the recirculation 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 6

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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Air Distribution

Cooling Mode

Heating Mode

Blend mode 9

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 temperature sensor B10/7 • Rear air flap motor  M2/21

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AAC Circuit Inputs B10/6

Temperature sensors B10/6 - Evap sensor 

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AAC Circuit Inputs B10/6

Temperature sensors B10/7

B10/6 - Evap sensor  B10/7 - Rear temp sensor 

B10/7

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AAC Circuit Inputs B10/6

B10/24 B10/7

Temperature sensors B10/6 - Evap sensor  B10/7 - Rear temp sensor 

B10/7

B10/24 - Center nozzle temp sensor 

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AAC Circuit Inputs B10/6

B10/24

B10/25

B10/7

Temperature sensors B10/6 - Evap sensor  B10/7 - Rear temp sensor 

B10/7

B10/24 - Center nozzle temp sensor  B10/25 - Front footwell temp sensor 

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AAC Circuit Inputs B10/6

B10/24 B10/25

B10/7

B32

Temperature sensors B10/6 - Evap sensor  B10/7 - Rear temp sensor 

B10/7

B10/24 - Center nozzle temp sensor  B10/25 - Front footwell temp sensor  B32 - Sun sensor 

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AAC Circuit Inputs B10/6

B10/24 B10/25

B10/7

B32

Temperature sensors B10/6 - Evap sensor  B10/7 - Rear temp sensor  B10/24 - Center nozzle temp sensor 

B14 - Ambient temp sensor  B10/7

B10/25 - Front footwell temp sensor  B32 - Sun sensor 

N22b1- In-car Temp N72/2 - Rear control sensor  field module N72 - Lower Control Panel B12/2 - Refrigerant pressure/temperature sensor 

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AAC Outputs M13

M2/2

• 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 water  pump • M2/2 - Module box blower motor 

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Electric Actuators The electric actuators are the same as those used on the 203 chassis

B+ Control

Coding pins

Ground 19

Compressor Control

A1 - Instrument cluster A9 - Compressor B10/6 - Evaporator sensor

B12/2 - Refrigerant pressure/temperature sensor   B14 - Outside temperature sensor   N22 - AAC pushbutton module 20

Cooling Fan Control

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Acronyms/ abbreviations abbreviations used in this program: AC - Air Conditioning A1 - Instrument Cluster  A9 - AC compressor  A32 - Recirculation air unit B10/6 - Evaporator temperature sensor  B10/7 - Rear temperature sensor  B10/24 - Center nozzle temperature sensor  B10/25 - Front footwell temperature sensor  B12/2 - Refrigerant pressure/temperature pressure/temperature sensor  B14 - Outside temperature sensor  B32 - Sun sensor  EVAP - evaporator  HVAC - Heat, Ventilation, Air Conditioning LED - Light emitting diode M’s - Motors N22 - AC pushbutton control unit N22b1 - In car temperature sensor  N29/2 - Rear blower regulator 

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