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AUTOMATIC AIR CONDITIONER


J AIR CONDITIONER

                                                                                                                                                            A


                                                                                                                                                            B
                                                                                  SECTION
                                                            AUTOMATIC AIR CONDITIONER                                                                       C


                                                                                                                                                            D


                                                                                                                                                            E
                                                               CONTENTS
PRECAUTIONS ......................................................... 5
                                                                     .            DESCRIPTION ................................................... 22
                                                                                                                                                   .        F
 Precautions for Supplemental Restraint System                                  Component Layout ................................................ 25
                                                                                                                                                   .
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                       LUBRICANT ............................................................. 26
                                                                                                                                                   .
 SIONER" ................................................................. 5
                                                                     .          Maintenance of Lubricant Quantity in Compressor 26                 ...      G
 Precautions for Battery Service ............................... 5   .            LUBRICANT ....................................................... 26
                                                                                                                                                   .
 Precautions for Working with HFC-134a (R-134a) 5                    .....        LUBRICANT RETURN OPERATION ................. 26                  .
   CONTAMINATED REFRIGERANT ...................... 6                 .            LUBRICANT ADJUSTING PROCEDURE FOR
                                                                                                                                                            H
 General Refrigerant Precautions ............................. 6     .            COMPONENTS REPLACEMENT EXCEPT
 Precautions for Refrigerant Connection .................. 7         .            COMPRESSOR ................................................. 27  .
   ABOUT ONE-TOUCH JOINT ............................... 7           .            LUBRICANT ADJUSTING PROCEDURE FOR
   FEATURES OF NEW TYPE REFRIGERANT                                               COMPRESSOR REPLACEMENT ...................... 28                 .         I
   CONNECTION ................................................... 10 .         AIR CONDITIONER CONTROL .............................. 29           .
   O-RING AND REFRIGERANT CONNECTION... 10                                      Description of Air Conditioner LAN Control System 29               ...
 Precautions for Servicing Compressor .................. 12          .          System Construction ............................................. 29
                                                                                                                                                   .        ATC
 Precautions for Service Equipment ....................... 12        .            OPERATION ....................................................... 30
                                                                                                                                                   .
   RECOVERY/RECYCLING EQUIPMENT ........... 12                       .            TRANSMISSION DATA AND TRANSMISSION
   ELECTRICAL LEAK DETECTOR ...................... 12                .            ORDER .............................................................. 30
                                                                                                                                                   .
                                                                                                                                                            K
   VACUUM PUMP ................................................ 13   .            AIR MIX DOOR CONTROL (AUTOMATIC TEM-
   MANIFOLD GAUGE SET ................................... 13         .            PERATURE CONTROL) .................................... 31        .
   SERVICE HOSES .............................................. 13   .            FAN SPEED CONTROL ..................................... 31       .
   SERVICE COUPLERS ....................................... 14       .            INTAKE DOOR CONTROL ................................ 31          .         L
   REFRIGERANT WEIGHT SCALE ..................... 14                 .            MODE DOOR CONTROL .................................. 31          .
   CHARGING CYLINDER ..................................... 14        .            MAGNET CLUTCH CONTROL .......................... 32              .
 Precautions for Leak Detection Dye ...................... 14        .            SELF-DIAGNOSIS SYSTEM ............................. 32           .        M
   IDENTIFICATION ............................................... 15 .          Description of Control System ............................... 33   .
   IDENTIFICATION LABEL FOR VEHICLE .......... 15                    .          Control Operation .................................................. 33
                                                                                                                                                   .
PREPARATION ........................................................ 16
                                                                     .            DISPLAY SCREEN ............................................. 34  .
 Special Service Tools ............................................ 16
                                                                     .            AUTO.ECON SWITCH ....................................... 34      .
 HFC-134a (R-134a) Service Tools and Equipment 17                    ...          TEMPERATURE CONTROL DIAL (POTENTIO
 Commercial Service Tools ..................................... 19   .            TEMPERATURE CONTROL) ............................. 34            .
REFRIGERATION SYSTEM .................................... 20         .            RECIRCULATION (REC) SWITCH .................... 34               .
 Refrigerant Cycle .................................................. 20
                                                                     .            FRESH (FRE) SWITCH ..................................... 34      .
   REFRIGERANT FLOW ...................................... 20        .            DEFROSTER (DEF) SWITCH ............................ 34           .
   FREEZE PROTECTION .................................... 20         .            REAR WINDOW DEFOGGER SWITCH ............ 34                      .
 Refrigerant System Protection .............................. 20     .            OFF SWITCH ..................................................... 34
                                                                                                                                                   .
   REFRIGERANT PRESSURE SENSOR ............ 20                       .            A/C SWITCH ...................................................... 34
                                                                                                                                                   .
   PRESSURE RELIEF VALVE .............................. 20           .            MODE SWITCH ................................................. 34 .
 V-6 Variable Displacement Compressor ................ 21            .            FAN SWITCHES ................................................ 34 .
   GENERAL INFORMATION ................................ 21           .            DUAL SWITCH (WITH LEFT AND RIGHT VEN-
                                                                                  TILATION TEMPERATURE SEPARATELY


Revision: 2006 August                                                   ATC-1                                                     2006 G35 Coupe
   CONTROL SYSTEM) ......................................... 34       .          DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
 Fail-safe Function .................................................. 35
                                                                      .          MOTOR PBR ......................................................74     .
 Discharge Air Flow ................................................ 36
                                                                      .        Intake Door Motor Circuit .......................................75      .
 System Description ................................................ 37
                                                                      .          INSPECTION FLOW ...........................................75          .
   SWITCHES AND THEIR CONTROL FUNCTION 37                             ...        SYSTEM DESCRIPTION ....................................76              .
 CAN Communication System Description ............. 38                .          COMPONENT DESCRIPTION ...........................77                    .
TROUBLE DIAGNOSIS ........................................... 39      .          DIAGNOSIS PROCEDURE FOR INTAKE DOOR
 CONSULT-II Function (BCM) ................................. 39       .          MOTOR ...............................................................77.
   CONSULT-II BASIC OPERATION ...................... 39               .        Blower Motor Circuit ...............................................78   .
   DATA MONITOR ................................................. 39  .          INSPECTION FLOW ...........................................78          .
 How to Perform Trouble Diagnosis for Quick and                                  SYSTEM DESCRIPTION ....................................79              .
 Accurate Repair ..................................................... 40
                                                                      .          COMPONENT DESCRIPTION ...........................80                    .
   WORK FLOW ..................................................... 40 .          DIAGNOSIS PROCEDURE FOR BLOWER
   SYMPTOM TABLE ............................................. 40     .          MOTOR ...............................................................80.
 Component Parts and Harness Connector Location 41                    ...        COMPONENT INSPECTION ..............................82                  .
   ENGINE COMPARTMENT ................................. 41            .        Magnet Clutch Circuit .............................................83    .
   PASSENGER COMPARTMENT ......................... 42                 .          INSPECTION FLOW ...........................................83          .
 Schematic .............................................................. 43
                                                                      .          SYSTEM DESCRIPTION ....................................84              .
 Wiring Diagram -- A/C -- ...................................... 44   .          DIAGNOSIS PROCEDURE FOR MAGNET
 Auto Amp. Terminals and Reference Value ........... 49               .          CLUTCH .............................................................84 .
   PIN CONNECTOR TERMINAL LAYOUT ........... 49                       .          COMPONENT INSPECTION ..............................89                  .
   TERMINALS AND REFERENCE VALUE FOR                                           Insufficient Cooling .................................................90 .
   DISPLAY AND A/C AUTO AMP. ......................... 49             .          INSPECTION FLOW ...........................................90          .
 Self-diagnosis Function ......................................... 52 .          PERFORMANCE TEST DIAGNOSIS .................91                         .
   DESCRIPTION ................................................... 52 .          PERFORMANCE CHART ...................................93                .
   FUNCTION CONFIRMATION PROCEDURE ..... 53                           .          TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
   AUXILIARY MECHANISM: TEMPERATURE                                              SURE ..................................................................94
                                                                                                                                                        .
   SETTING TRIMMER .......................................... 59      .          DIAGNOSIS PROCEDURE FOR INSUFFI-
   AUXILIARY MECHANISM: FOOT POSITION                                            CIENT COOLING ................................................96       .
   SETTING TRIMMER .......................................... 60      .        Insufficient Heating ................................................98  .
   AUXILIARY MECHANISM: INLET PORT MEM-                                          INSPECTION FLOW ...........................................98          .
   ORY FUNCTION ................................................ 60   .        Noise ......................................................................99
                                                                                                                                                        .
 Operational Check ................................................. 61
                                                                      .          INSPECTION FLOW ...........................................99          .
   CHECKING MEMORY FUNCTION .................... 61                   .        Self-diagnosis ...................................................... 100.
   CHECKING BLOWER ........................................ 61        .          INSPECTION FLOW ......................................... 100          .
   CHECKING DISCHARGE AIR ........................... 61              .        Memory Function ................................................. 101    .
   CHECKING INTAKE AIR .................................... 61        .          INSPECTION FLOW ......................................... 101          .
   CHECKING TEMPERATURE DECREASE ........ 61                          .        Ambient Sensor Circuit ........................................ 101      .
   CHECKING TEMPERATURE INCREASE ......... 61                         .          COMPONENT DESCRIPTION ......................... 101                    .
   CHECKING A/C SWITCH .................................. 62          .          AMBIENT TEMPERATURE INPUT PROCESS .102
   CHECKING AUTO. ECON MODE ...................... 62                 .          DIAGNOSIS PROCEDURE FOR AMBIENT
 Power Supply and Ground Circuit for Auto Amp. ... 62                            SENSOR ........................................................... 102 .
   INSPECTION FLOW .......................................... 62      .          COMPONENT INSPECTION ............................ 103                  .
   COMPONENT DESCRIPTION ........................... 63               .        In-vehicle Sensor Circuit ...................................... 104     .
   DIAGNOSIS PROCEDURE FOR A/C SYSTEM... 63                                      COMPONENT DESCRIPTION ......................... 104                    .
 LAN System Circuit ............................................... 65.          DIAGNOSIS PROCEDURE FOR IN-VEHICLE
   DIAGNOSIS PROCEDURE FOR LAN CIRCUIT 65                             ...        SENSOR ........................................................... 105 .
 Mode Door Motor Circuit ....................................... 69   .          COMPONENT INSPECTION ............................ 106                  .
   INSPECTION FLOW .......................................... 69      .        Sunload Sensor Circuit ........................................ 107      .
   SYSTEM DESCRIPTION ................................... 70          .          COMPONENT DESCRIPTION ......................... 107                    .
   COMPONENT DESCRIPTION ........................... 71               .          SUNLOAD INPUT PROCESS .......................... 107                   .
   DIAGNOSIS PROCEDURE FOR MODE DOOR                                             DIAGNOSIS PROCEDURE FOR SUNLOAD
   MOTOR .............................................................. 71
                                                                      .          SENSOR ........................................................... 107 .
 Air Mix Door Motor Circuit ..................................... 72  .          COMPONENT INSPECTION ............................ 109                  .
   INSPECTION FLOW .......................................... 72      .        Intake Sensor Circuit ............................................ 110   .
   SYSTEM DESCRIPTION ................................... 73          .          COMPONENT DESCRIPTION ......................... 110                    .
   COMPONENT DESCRIPTION ........................... 74               .          DIAGNOSIS PROCEDURE FOR INTAKE SEN-
   DIAGNOSIS PROCEDURE FOR AIR MIX DOOR 74                            ...        SOR .................................................................. 110
                                                                                                                                                        .
 Air Mix Door Motor PBR Circuit ............................. 74      .

Revision: 2006 August                                                   ATC-2                                                       2006 G35 Coupe
    COMPONENT INSPECTION ............................ 111                 .       MODE DOOR MOTOR ........................................... 130          .
  Multiplex Communication Circuit ..........................112           .        Removal and Installation ..................................... 130      .       A
    DIAGNOSIS PROCEDURE FOR MULTIPLEX                                                REMOVAL ........................................................ 130  .
    COMMUNICATION ...........................................112          .          INSTALLATION ................................................ 130     .
A/C AND AUDIO CONTROLLER ...........................114                   .       AIR MIX DOOR MOTOR ........................................ 131          .       B
  Removal and Installation ......................................114      .        Removal and Installation ..................................... 131      .
    REMOVAL .........................................................114  .          REMOVAL ........................................................ 131  .
    INSTALLATION .................................................114     .          INSTALLATION ................................................ 131     .
AUTO AMP .............................................................115 .       DUCTS AND GRILLES .......................................... 132         .       C
  Removal and Installation of Display and A/C Auto                                 Removal and Installation ..................................... 132      .
  Amp. .....................................................................115
                                                                          .          COMPONENT LAYOUT ................................... 132              .
    REMOVAL .........................................................115  .          REMOVAL ........................................................ 132  .       D
    INSTALLATION .................................................115     .          INSTALLATION ................................................ 134     .
AMBIENT SENSOR ................................................116        .       REFRIGERANT LINES .......................................... 135         .
  Removal and Installation ......................................116      .        HFC-134a (R-134a) Service Procedure .............. 135                  .       E
    REMOVAL .........................................................116  .          SETTING OF SERVICE TOOLS AND EQUIP-
    INSTALLATION .................................................116     .          MENT ............................................................... 135
                                                                                                                                                           .
IN-VEHICLE SENSOR ............................................117         .        Components ........................................................ 137 .
  Removal and Installation ......................................117      .        Removal and Installation of Compressor ............. 137                .       F
    REMOVAL .........................................................117  .          REMOVAL ........................................................ 137  .
    INSTALLATION .................................................117     .          INSTALLATION ................................................ 138     .
SUNLOAD SENSOR ..............................................118          .        Removal and Installation of Compressor Clutch . 138                             G
  Removal and Installation ......................................118      .          REMOVAL ........................................................ 138  .
    REMOVAL .........................................................118  .          INSTALLATION ................................................ 140     .
    INSTALLATION .................................................118     .        Removal and Installation of Low-pressure Flexible                               H
INTAKE SENSOR ...................................................119      .        Hose .................................................................... 141
                                                                                                                                                           .
  Removal and Installation ......................................119      .          REMOVAL ........................................................ 141  .
    REMOVAL .........................................................119  .          INSTALLATION ................................................ 142     .
                                                                                                                                                                    I
    INSTALLATION .................................................119     .        Removal and Installation of High-pressure Flexible
BLOWER UNIT ...................................................... 120    .        Hose .................................................................... 142
                                                                                                                                                           .
  Removal and Installation ..................................... 120      .          REMOVAL ........................................................ 142  .
    REMOVAL ........................................................ 120  .          INSTALLATION ................................................ 143     .       ATC
    INSTALLATION ................................................ 120     .        Removal and Installation of Low-pressure Pipe 1
  Disassembly and Assembly ................................ 121           .        (Engine Compartment) ........................................ 143       .
BLOWER MOTOR ................................................. 122        .          REMOVAL ........................................................ 143  .       K
  Removal and Installation ..................................... 122      .          INSTALLATION ................................................ 144     .
    REMOVAL ........................................................ 122  .        Removal and Installation of High-pressure Pipe 1
    INSTALLATION ................................................ 122     .        (Engine Compartment) ........................................ 144       .        L
INTAKE DOOR MOTOR ........................................ 123            .          REMOVAL ........................................................ 144  .
  Removal and Installation ..................................... 123      .          INSTALLATION ................................................ 145     .
    REMOVAL ........................................................ 123  .        Removal and Installation of Low-pressure Pipe 2
    INSTALLATION ................................................ 123     .        and High-pressure Pipe 2 .................................... 145       .       M
IN-CABIN MICROFILTER ...................................... 124           .          REMOVAL ........................................................ 145  .
  Removal and Installation ..................................... 124      .          INSTALLATION ................................................ 146     .
    FUNCTION ....................................................... 124  .        Removal and Installation of Liquid Tank .............. 147              .
    REPLACEMENT TIMING ................................. 124              .          REMOVAL ........................................................ 147  .
    REPLACEMENT PROCEDURES .................... 124                       .          INSTALLATION ................................................ 148     .
HEATER & COOLING UNIT ASSEMBLY ............. 125                          .        Removal and Installation of Condenser ............... 148               .
  Removal and Installation ..................................... 125      .          REMOVAL ........................................................ 148  .
    REMOVAL ........................................................ 125  .          INSTALLATION ................................................ 149     .
    INSTALLATION ................................................ 126     .        Removal and Installation of Refrigerant Pressure
  Disassembly and Assembly ................................ 127           .        Sensor ................................................................. 149
                                                                                                                                                           .
HEATER CORE ..................................................... 129     .          REMOVAL ........................................................ 149  .
  Removal and Installation ..................................... 129      .          INSTALLATION ................................................ 150     .
    REMOVAL ........................................................ 129  .        Removal and Installation of Evaporator ............... 150              .
    INSTALLATION ................................................ 129     .          REMOVAL ........................................................ 150  .
                                                                                     INSTALLATION ................................................ 150     .
                                                                                   Removal and Installation of Expansion Valve ...... 151                  .
                                                                                     REMOVAL ........................................................ 151  .

Revision: 2006 August                                                      ATC-3                                                        2006 G35 Coupe
   INSTALLATION ................................................. 151 .          DETECTOR ...................................................... 153  .
 Checking for Refrigerant Leaks ........................... 152       .          CHECKING PROCEDURE ............................... 154               .
 Checking System for Leaks Using the Fluorescent                              SERVICE DATA AND SPECIFICATIONS (SDS) ... 156                           .
 Leak Detector ...................................................... 152
                                                                      .        Compressor ......................................................... 156
                                                                                                                                                      .
 Dye Injection ........................................................ 152
                                                                      .        Lubricant .............................................................. 156
                                                                                                                                                      .
 Electrical Leak Detector ....................................... 153 .        Refrigerant ........................................................... 156
                                                                                                                                                      .
   PRECAUTIONS FOR HANDLING LEAK                                               Engine Idling Speed ............................................. 156  .
                                                                               Belt Tension ......................................................... 156
                                                                                                                                                      .




Revision: 2006 August                                                  ATC-4                                                       2006 G35 Coupe
                                              PRECAUTIONS

PRECAUTIONS                                                         PFP:00001
                                                                                                                         A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                           NJS0002G


The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along                            B
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front              C
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:                                                                                                                 D
q    To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
     in the event of a collision which would result in air bag inflation, all maintenance must be per-
     formed by an authorized NISSAN/INFINITI dealer.                                                                     E
q    Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
     sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
     Bag Module, see the SRS section.                                                                                    F
q    Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
     Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
     harness connectors.
                                                                                                                         G
Precautions for Battery Service                                                                               NJS000CU


Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the                H
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.
                                                                                                                         I
Precautions for Working with HFC-134a (R-134a)                                                                NJS0002H


CAUTION:
q  CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants ATC
   are mixed and compressor malfunction is likely to occur, refer to "CONTAMINATED REFRIGER-
   ANT" below. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use
   Refrigerant Recovery/Recycling Recharging equipment and Refrigerant Identifier.
q  Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo- K
   nents. If lubricant other than that specified is used, compressor malfunction is likely to occur.
q  The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
   lowing handling precautions must be observed:                                                        L



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