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AUTOMATIC AIR CONDITIONER


J AIR CONDITIONER

                                                                                                                                                            A




                                                                                  SECTION
                                                            AUTOMATIC AIR CONDITIONER
                                                                                                            ATC                                             B



                                                                                                                                                            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 Working with HFC-134a (R-134a) 5                    .....        LUBRICANT ....................................................... 26
                                                                                                                                                   .
   CONTAMINATED REFRIGERANT ...................... 6                 .            LUBRICANT RETURN OPERATION ................. 26                  .
 General Refrigerant Precautions ............................. 6     .            LUBRICANT ADJUSTING PROCEDURE FOR
                                                                                                                                                            H
 Lubricant 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 ...................... 27                 .         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
   ELECTRONIC 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                 .            OUTLET DOOR CONTROL ............................... 31           .
   CHARGING CYLINDER ..................................... 14        .            MAGNET CLUTCH CONTROL .......................... 32              .
 Precautions for Leak Detection Dye ...................... 15        .            SELF-DIAGNOSTIC SYSTEM ........................... 32            .        M
   IDENTIFICATION ............................................... 15 .          Description of Control System ............................... 33   .
   IDENTIFICATION LABEL FOR VEHICLE .......... 15                    .          Control Operation .................................................. 33
                                                                                                                                                   .
 Wiring Diagrams and Trouble Diagnosis ............... 15            .            DISPLAY SCREEN ............................................. 34  .
PREPARATION ........................................................ 16
                                                                     .            AUTO.ECON SWITCH ....................................... 34      .
 Special Service Tools ............................................ 16
                                                                     .            TEMPERATURE CONTROL DIAL (POTENTIO
 HFC-134a (R-134a) Service Tools and Equipment 17                    ...          TEMPERATURE CONTROL) ............................. 34            .
 Commercial Service Tools ..................................... 19   .            RECIRCULATION (REC) SWITCH .................... 34               .
REFRIGERATION SYSTEM .................................... 20         .            FRESH (FRE) SWITCH ..................................... 34      .
 Refrigerant Cycle .................................................. 20
                                                                     .            DEFROSTER (DEF) SWITCH ............................ 34           .
   REFRIGERANT FLOW ...................................... 20        .            REAR WINDOW DEFOGGER SWITCH ............ 34                      .
   FREEZE PROTECTION .................................... 20         .            OFF SWITCH ..................................................... 34
                                                                                                                                                   .
 Refrigerant System Protection .............................. 20     .            A/C SWITCH ...................................................... 34
                                                                                                                                                   .
   REFRIGERANT PRESSURE SENSOR ............ 20                       .            MODE SWITCH ................................................. 34 .
   PRESSURE RELIEF VALVE .............................. 20           .            FAN SWITCHES ................................................ 34 .
 V-6 Variable Displacement Compressor ................ 21            .            DUAL SWITCH (WITH LEFT AND RIGHT VEN-
   GENERAL INFORMATION ................................ 21           .            TILATION TEMPERATURE SEPARATELY


Edition; 2004 September                                                 ATC-1                                                     2005 G35 Sedan
   CONTROL SYSTEM) ......................................... 34         .          DOOR .................................................................76
                                                                                                                                                          .
 Fail-Safe Function ................................................. 35.        Air Mix Door Motor PBR Circuit .............................76           .
 Discharge Air Flow ................................................ 36 .          DIAGNOSTIC PROCEDURE FOR AIR MIX
 System Description ................................................ 37 .          DOOR PBR .........................................................76   .
   SWITCHES AND THEIR CONTROL FUNCTION 37                               ...      Intake Door Motor Circuit .......................................77      .
 CAN Communication System Description ............. 38                  .          INSPECTION FLOW ...........................................77          .
TROUBLE DIAGNOSIS ........................................... 39        .          SYSTEM DESCRIPTION ....................................78              .
 CONSULT-II Function (BCM) ................................. 39         .          COMPONENT DESCRIPTION ...........................79                    .
   CONSULT-II BASIC OPERATION ...................... 39                 .          DIAGNOSTIC PROCEDURE FOR INTAKE
   DATA MONITOR ................................................. 40    .          DOOR MOTOR ...................................................79       .
 How to Perform Trouble Diagnosis for Quick and                                  Blower Motor Circuit ...............................................80   .
 Accurate Repair ..................................................... 41
                                                                        .          INSPECTION FLOW ...........................................80          .
   WORK FLOW ..................................................... 41   .          SYSTEM DESCRIPTION ....................................81              .
   SYMPTOM TABLE ............................................. 41       .          COMPONENT DESCRIPTION ...........................82                    .
 Component Parts and Harness Connector Location 42                      ...        DIAGNOSTIC PROCEDURE FOR BLOWER
   ENGINE COMPARTMENT ................................. 42              .          MOTOR ...............................................................82.
   PASSENGER COMPARTMENT ......................... 43                   .          COMPONENT INSPECTION ..............................85                  .
 Schematic .............................................................. 44
                                                                        .        Magnet Clutch Circuit .............................................86    .
 Wiring Diagram --A/C-- ........................................ 45     .          INSPECTION FLOW ...........................................86          .
 Auto Amp. Terminals and Reference Value ........... 50                 .          SYSTEM DESCRIPTION ....................................87              .
   PIN CONNECTOR TERMINAL LAYOUT ........... 50                         .          DIAGNOSTIC PROCEDURE FOR MAGNET
   TERMINALS AND REFERENCE VALUE FOR                                               CLUTCH .............................................................87 .
   DISPLAY AND A/C AUTO AMP. ......................... 50               .          COMPONENT INSPECTION ..............................92                  .
 Self-Diagnosis Function ......................................... 53   .        Insufficient Cooling .................................................93 .
   DESCRIPTION ................................................... 53   .          INSPECTION FLOW ...........................................93          .
   FUNCTION CONFIRMATION PROCEDURE ..... 54                             .          PERFORMANCE TEST DIAGNOSIS .................95                         .
   AUXILIARY MECHANISM: TEMPERATURE                                                PERFORMANCE CHART ...................................97                .
   SETTING TRIMMER .......................................... 60        .          TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
   AUXILIARY MECHANISM: FOOT POSITION                                              SURE ..................................................................99
                                                                                                                                                          .
   SETTING TRIMMER .......................................... 61        .          DIAGNOSTIC PROCEDURE FOR INSUFFI-
   AUXILIARY MECHANISM: INLET PORT MEM-                                            CIENT COOLING .............................................. 101       .
   ORY FUNCTION ................................................ 61     .        Insufficient Heating .............................................. 103  .
 Operational Check ................................................. 62 .          INSPECTION FLOW ......................................... 103          .
   CHECKING MEMORY FUNCTION .................... 62                     .        Noise .................................................................... 104
                                                                                                                                                          .
   CHECKING BLOWER ........................................ 62          .          INSPECTION FLOW ......................................... 104          .
   CHECKING DISCHARGE AIR ........................... 62                .        Self-Diagnosis ...................................................... 105.
   CHECKING RECIRCULATION ........................... 63                .          INSPECTION FLOW ......................................... 105          .
   CHECKING TEMPERATURE DECREASE ........ 63                            .        Memory Function ................................................. 106    .
   CHECKING TEMPERATURE INCREASE ......... 63                           .          INSPECTION FLOW ......................................... 106          .
   CHECK A/C SWITCH ......................................... 63        .        Ambient Sensor Circuit ........................................ 106      .
   CHECKING AUTO. ECON MODE ...................... 64                   .          COMPONENT DESCRIPTION ......................... 106                    .
 Power Supply and Ground Circuit for Auto Amp. ... 64                              AMBIENT TEMPERATURE INPUT PROCESS .107
   INSPECTION FLOW .......................................... 64        .          DIAGNOSTIC PROCEDURE FOR AMBIENT
   COMPONENT DESCRIPTION ........................... 65                 .          SENSOR ........................................................... 107 .
   DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 65                               ...        COMPONENT INSPECTION ............................ 108                  .
 LAN System Circuit ............................................... 67  .        In-Vehicle Sensor Circuit ...................................... 109     .
   DIAGNOSTIC PROCEDURE FOR LAN CIR-                                               COMPONENT DESCRIPTION ......................... 109                    .
   CUIT ................................................................... 67
                                                                        .          DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
 Mode Door Motor Circuit ....................................... 71     .          SENSOR ........................................................... 110 .
   INSPECTION FLOW .......................................... 71        .          COMPONENT INSPECTION ............................ 111                  .
   SYSTEM DESCRIPTION ................................... 72            .        Sunload Sensor Circuit ........................................ 112      .
   COMPONENT DESCRIPTION ........................... 73                 .          COMPONENT DESCRIPTION ......................... 112                    .
   DIAGNOSTIC PROCEDURE FOR MODE                                                   SUNLOAD INPUT PROCESS .......................... 112                   .
   DOOR MOTOR .................................................. 73     .          DIAGNOSTIC PROCEDURE FOR SUNLOAD
 Air Mix Door Motor Circuit ..................................... 74    .          SENSOR ........................................................... 112 .
   INSPECTION FLOW .......................................... 74        .          COMPONENT INSPECTION ............................ 114                  .
   SYSTEM DESCRIPTION ................................... 75            .        Intake Sensor Circuit ............................................ 115   .
   COMPONENT DESCRIPTION ........................... 76                 .          COMPONENT DESCRIPTION ......................... 115                    .
   DIAGNOSTIC PROCEDURE FOR AIR MIX                                                DIAGNOSTIC PROCEDURE FOR INTAKE SEN-

Edition; 2004 September                                                   ATC-2                                                       2005 G35 Sedan
    SOR ..................................................................115
                                                                          .       AIR MIX DOOR MOTOR ........................................ 135          .
    COMPONENT INSPECTION ............................116                  .        Removal and Installation ..................................... 135      .       A
  Multiplex Communication Circuit ..........................117           .          REMOVAL ........................................................ 135  .
    DIAGNOSTIC PROCEDURE FOR MULTIPLEX                                               INSTALLATION ................................................ 135     .
    COMMUNICATION ...........................................117          .       DUCTS AND GRILLES .......................................... 136         .       B
A/C AND AUDIO CONTROLLER ...........................119                   .        Removal and Installation ..................................... 136      .
  Removal and Installation ......................................119      .          REMOVAL ........................................................ 136  .
    REMOVAL .........................................................119  .          INSTALLATION ................................................ 139     .
    INSTALLATION .................................................119     .       REFRIGERANT LINES .......................................... 140         .       C
AUTO AMP ............................................................ 120 .        HFC-134a (R-134a) Service Procedure .............. 140                  .
  Removal and Installation of Display and A/C Auto                                   SETTING OF SERVICE TOOLS AND EQUIP-
  Amp. .................................................................... 120
                                                                          .          MENT ............................................................... 140
                                                                                                                                                           .       D
    REMOVAL ........................................................ 120  .        Components ........................................................ 142 .
    INSTALLATION ................................................ 120     .        Removal and Installation of Compressor ............. 142                .
AMBIENT SENSOR ............................................... 121        .          REMOVAL ........................................................ 142  .       E
  Removal and Installation ..................................... 121      .          INSTALLATION ................................................ 144     .
    REMOVAL ........................................................ 121  .        Removal and Installation of Compressor Clutch . 144
    INSTALLATION ................................................ 121     .          REMOVAL ........................................................ 144  .
IN-VEHICLE SENSOR ........................................... 122         .          INSTALLATION ................................................ 146     .       F
  Removal and Installation ..................................... 122      .        Removal and Installation of Low-pressure Flexible
    REMOVAL ........................................................ 122  .        Hose .................................................................... 147
                                                                                                                                                           .
    INSTALLATION ................................................ 122     .          REMOVAL ........................................................ 147  .       G
SUNLOAD SENSOR ............................................. 123          .          INSTALLATION ................................................ 148     .
  Removal and Installation ..................................... 123      .        Removal and Installation of High-Pressure Flexible
    REMOVAL ........................................................ 123  .        Hose .................................................................... 148
                                                                                                                                                           .       H
    INSTALLATION ................................................ 123     .          REMOVAL ........................................................ 148  .
INTAKE SENSOR .................................................. 124      .          INSTALLATION ................................................ 149     .
  Removal and Installation ..................................... 124      .        Removal and Installation of Low-Pressure Pipe 1
                                                                                                                                                                    I
    REMOVAL ........................................................ 124  .        (Engine Compartment) ........................................ 149       .
    INSTALLATION ................................................ 124     .          REMOVAL ........................................................ 149  .
BLOWER UNIT ...................................................... 125    .          INSTALLATION ................................................ 150     .
  Removal and Installation ..................................... 125      .        Removal and Installation of High-Pressure Pipe 1                                ATC
    REMOVAL ........................................................ 125  .        (Engine Compartment) ........................................ 150       .
    INSTALLATION ................................................ 125     .          REMOVAL ........................................................ 150  .
  Disassembly and Assembly ................................ 126           .          INSTALLATION ................................................ 151     .       K
BLOWER MOTOR ................................................. 127        .        Removal and Installation of Low-Pressure Pipe 2
  Removal and Installation ..................................... 127      .        and High-pressure Pipe 2 .................................... 151       .
    REMOVAL ........................................................ 127  .          REMOVAL ........................................................ 151  .        L
    INSTALLATION ................................................ 127     .          INSTALLATION ................................................ 152     .
INTAKE DOOR MOTOR ........................................ 128            .        Removal and Installation of Liquid Tank .............. 153              .
  Removal and Installation ..................................... 128      .          REMOVAL ........................................................ 153  .
    REMOVAL ........................................................ 128  .          INSTALLATION ................................................ 153     .       M
    INSTALLATION ................................................ 128     .        Removal and Installation of Condenser ............... 154               .
IN-CABIN MICROFILTER ...................................... 129           .          REMOVAL ........................................................ 154  .
  Removal and Installation ..................................... 129      .          INSTALLATION ................................................ 155     .
    FUNCTION ....................................................... 129  .        Removal and Installation of Refrigerant Pressure
    REPLACEMENT TIMING ................................. 129              .        Sensor ................................................................. 155
                                                                                                                                                           .
    REPLACEMENT PROCEDURES .................... 129                       .          REMOVAL ........................................................ 155  .
HEATER & COOLING UNIT ASSEMBLY ............. 130                          .          INSTALLATION ................................................ 155     .
  Removal and Installation ..................................... 130      .        Removal and Installation of Evaporator ............... 156              .
    REMOVAL ........................................................ 130  .          REMOVAL ........................................................ 156  .
    INSTALLATION ................................................ 131     .          INSTALLATION ................................................ 156     .
  Disassembly and Assembly ................................ 132           .        Removal and Installation of Expansion Valve ...... 157                  .
MODE DOOR MOTOR .......................................... 134            .          REMOVAL ........................................................ 157  .
  Removal and Installation ..................................... 134      .          INSTALLATION ................................................ 157     .
    REMOVAL ........................................................ 134  .        Checking for Refrigerant Leaks ........................... 158          .
    INSTALLATION ................................................ 134     .        Checking System for Leaks Using the Fluorescent
                                                                                   Leak Detector ...................................................... 158.


Edition; 2004 September                                                    ATC-3                                                        2005 G35 Sedan
 Dye Injection ........................................................ 158
                                                                      .       Compressor ......................................................... 162
                                                                                                                                                     .
 Electronic Refrigerant Leak Detector ................... 159         .       Lubricant .............................................................. 162
                                                                                                                                                     .
   PRECAUTIONS FOR HANDLING LEAK                                              Refrigerant ........................................................... 162
                                                                                                                                                     .
   DETECTOR ...................................................... 159.       Engine Idling Speed ............................................. 162  .
   CHECKING PROCEDURE ............................... 160             .       Belt Tension ......................................................... 162
                                                                                                                                                     .
SERVICE DATA AND SPECIFICATIONS (SDS) ... 162                         .




Edition; 2004 September                                                ATC-4                                                      2005 G35 Sedan
                                              PRECAUTIONS

PRECAUTIONS                                                         PFP:00001
                                                                                                                         A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                           AJS001P0


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 Working with HFC-134a (R-134a)                                                                AJS00118


WARNING:
q CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants H
  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.                     I
q Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
  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- ATC
  lowing handling precautions must be observed:



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