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, 2002
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 it's successors. Published by Mercedes-Benz USA, LLC Printed in U. S.A.
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Objectives • Identify versions • Explain and demonstrate system operation • Show component location • Explain solar panel function and component location • Show new tool for the AC line
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Versions • Identify differences between: – 2 Zone / Automatic Air Conditioning / AAC / Thermatic (Standard E320)
– 4 Zone / Convenience Automatic Air Conditioning / C-AAC / Thermotronic (Standard E500, optional E320)
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Comparison Feature Temperature Zones Manual center vent Humidity sensor Multi function sensor Sun sensor Key dependant features Inlet filters Charcoal filter Actuator motors B pillar vents Solar roof Diagnostics through N93
2 Zone system Two Yes Yes No No No Combo filter No 6 No Optional Yes
4 Zone system Four Yes No Yes Yes Yes Dust filter Yes 12 Yes Optional Yes
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Control Module - 2 Zone
1. Temperature left side 2. Defrost 3. Increase Air Flow 4. Air distribution rocker switch 5. Rear window heater 6. Temperature right side 7. Residual heat
8. Economy mode 9. Air distribution indicator 10. On/Off 11. Air Flow Indicator 12. Reduce Air Flow 13. Recirculated Air Button 14. Automatic Air distribution and Blower Output
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Control Module - 4 Zone
1. Left air distribution 2. Defrost 3. Left temperature rocker switch 4. Display 5. Right temperature display switch 6. Rear window heater 7. Right air distribution 8. Automatic air distribution and blower capacity on right
9. Activated charcoal filter 10. Rear system control switchover 11. Increasing air flow 12. On/Off 13. Reducing air flow 14. Residual Heat / compressor off 15. Recirculated air button 16. Automatic air distribution and blower capacity on left 7
Rear Control Unit
1. Left swivel air vents in rear 2. Right swivel center vent in rear 3. Air quantity for left swivel air vent in rear 4. Air quantity for right swivel air vent in rear 5. Left temperature rocker switch 6. Right temperature rocker switch 7. Display 8
Filters • Dust filter (4 Zone system) • Combination filter (2 Zone only)
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Charcoal Filters
4 Zone only 10
Compressor Denso compressor • Clutchless • 2 - 100% swept volume • Controlled by N22/... via left front SAM (N10/1)
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New AC Connections (Low side suction line only) New style connection
211 589 00 63 00
Location: left inner fender 12
Receiver Dryer
• Located at bottom of condenser • No insert like a 203 • Replace complete receiver drier 13
Shut-Off Valve Location M16/32
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Coolant Pump (M13)
Controlled via right front SAM (N10/1) 15
Solar Panel Control Unit (N34/1)
Note: N34/1 is located above the glove box, the dash pad must be removed to access.
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Solar Panels (G6) • 24 Solar panels • 8 on front • 16 on rear Provides interior ventilation based on: • AC control unit inactive • Ambient temperature (sensor located in N34/1) • Solar energy
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In-car Temperature Sensors
B10/4 with aspirator
N70b1 with aspirator
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Humidity Sensor (B31/2) (2 Zone only) Measures humidity, value used to determine compressor control
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Multi Function Sensor (B31) (4 Zone only) Measures: • ambient temperature • humidity • pollution concentration Inputs used for: • calculating climate control • actuating the compressor • recirculation based on pollution (AC "ON", >7oC, activated filter button actuated)
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Networking 2 Zone
M2/5 M2/6 M2/7
Fresh/recirculation flap motor Left blend air flap Right blend air flap
M2/15 Footwell flaps M2/16 Defroster flaps M2/22 Center outlet flap
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Networking 4 Zone
M2/5 M2/6 M2/7 M2/8
Fresh/recirculation flap motor Left blend air flap Right blend air flap Left defroster flap
M2/9 Right defroster flap M2/10 Left footwell flap M2/11 Right footwell flap M2/12 Left center vent
M2/13 Right center vent M16/30 Left rear blend flap M16/31 Right rear blend flap A32m2 Charcoal filter motor
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2 Zone System
A - Fresh or recirculated air B- Cooled air C - Heated air D - Blend air
7 - Rear footwell 8 - Left front footwell 9 - Right front footwell 10 - Front lateral outlet 11 - Front center outlet
A32m1 - Blower motor A32m2 - Charcoal filter motor M2/5 - Fresh/recirculate actuator M2/6 - Left blend flap actuator M2/7 - Right blend flap actuator M2/8 - Left defroster actuator M2/9 - Right defroster actuator
M2/10 -Left footwell actuator M2/11 - Right footwell actuator M2/12 - Left center actuator M2/13 - Right center actuator M16/30 Left rear actuator M16/31 - Right rear actuator 24
Side Vents (4 Zone)
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Key Dependent Features (4-Zone system only)
• AC OFF mode activated (on/off) • activated charcoal filter activated (on/off) • automatic mode with automatic blower control and air distribution left/right activated (on/off) • during manual mode: selected blower speed • selected temperature target values (four values) Key dependent feature can be toggled on/off via the IC. 26
Rear window defroster function Solar stationary ventilation Regulation of AAC Air ducting Solar generator control module Heater water circulation pump Heat exchanger shut-off motor Activated carbon filter Air humidity sensor Notes on AC bus AAC function description Notes on C-AAC bus C-AAC functional description Table of contents – AAC Operating module – AAC AAC component summary Refrigerant compressor Temperature control function Temperature control function In-car temperature sensor Code-related storage block selection Left SAM Passenger SAM Rear SAM Left front door DCM Right front door DCM Rear door DCM EIS Overhead control panel Lower control panel 27
