Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti G35 2003-2005 Coupe Sedan Approved Infiniti G35 Sedan 2003 atc
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AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
A
B
SECTION
AUTOMATIC AIR CONDITIONER C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5
. GENERAL INFORMATION ................................ 21 . F
Precautions for Supplemental Restraint System DESCRIPTION ................................................... 22
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Component Layout ................................................ 25
.
SIONER" ................................................................. 5
. LUBRICANT ............................................................. 26
. G
Precautions for Working with HFC-134a (R-134a) 5 ..... Maintenance of Lubricant Quantity in Compressor 26 ...
CONTAMINATED REFRIGERANT ...................... 6 . LUBRICANT ....................................................... 26
.
General Refrigerant Precautions ............................. 6 . LUBRICANT RETURN OPERATION ................. 26 .
H
Lubricant Precautions ............................................. 6
. LUBRICANT ADJUSTING PROCEDURE FOR
Precautions for Refrigerant Connection .................. 7 . COMPONENTS REPLACEMENT EXCEPT
ABOUT ONE-TOUCH JOINT ............................... 7 . COMPRESSOR ................................................. 27 .
FEATURES OF NEW TYPE REFRIGERANT LUBRICANT ADJUSTING PROCEDURE FOR I
CONNECTION ................................................... 10 . COMPRESSOR REPLACEMENT ...................... 27 .
O-RING AND REFRIGERANT CONNECTION... 10 AIR CONDITIONER CONTROL .............................. 29 .
Precautions for Servicing Compressor .................. 12 . Description of Air Conditioner LAN Control System 29 ... ATC
Precautions for Service Equipment ....................... 12 . System Construction ............................................. 29
.
RECOVERY/RECYCLING EQUIPMENT ........... 12 . OPERATION ....................................................... 30
.
ELECTRONIC LEAK DETECTOR ..................... 12 . TRANSMISSION DATA AND TRANSMISSION
K
VACUUM PUMP ................................................ 13 . ORDER .............................................................. 30
.
MANIFOLD GAUGE SET ................................... 13 . AIR MIX DOOR CONTROL (AUTOMATIC TEM-
SERVICE HOSES .............................................. 13 . PERATURE CONTROL) .................................... 31 .
SERVICE COUPLERS ....................................... 14 . FAN SPEED CONTROL ..................................... 31 . L
REFRIGERANT WEIGHT SCALE ..................... 14 . INTAKE DOOR CONTROL ................................ 31 .
CALIBRATING ACR4 WEIGHT SCALE ............. 14 . OUTLET DOOR CONTROL ............................... 31 .
CHARGING CYLINDER ..................................... 14 . MAGNET CLUTCH CONTROL .......................... 32 . M
Precautions for Leak Detection Dye ...................... 15 . SELF-DIAGNOSTIC SYSTEM ........................... 32 .
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 SWITCH (POTENTIO TEM-
HFC-134a (R-134a) Service Tools and Equipment 17 ... PERATURE 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-
Revision; 2004 April ATC-1 2003 G35 Sedan
TILATION TEMPERATURE SEPARATELY DIAGNOSTIC PROCEDURE FOR MODE
CONTROL SYSTEM) ......................................... 34 . DOOR MOTOR ...................................................80 .
Fail-Safe Function ................................................. 35. Air Mix Door Motor Circuit ......................................80 .
Discharge Air Flow ................................................ 36 . INSPECTION FLOW ...........................................81 .
System Description ................................................ 37 . SYSTEM DESCRIPTION ....................................82 .
SWITCHES AND THEIR CONTROL FUNCTION 37 ... COMPONENT DESCRIPTION ...........................83 .
CAN Communication System Description ............. 38 . DIAGNOSTIC PROCEDURE FOR AIR MIX
CAN Communication Unit ...................................... 38 . DOOR .................................................................83
.
TYPE 1/TYPE 3 .................................................. 38 . Air Mix Door Motor PBR Circuit .............................83 .
TYPE 2 ............................................................... 40
. DIAGNOSTIC PROCEDURE FOR AIR MIX
TROUBLE DIAGNOSIS ........................................... 42 . DOOR PBR .........................................................83 .
CONSULT-II ........................................................... 42
. Intake Door Motor Circuit .......................................84 .
CONSULT-II BASIC OPERATION ...................... 42 . INSPECTION FLOW ...........................................84 .
DATA MONITOR ................................................. 43 . SYSTEM DESCRIPTION ....................................85 .
How to Perform Trouble Diagnosis for Quick and COMPONENT DESCRIPTION ...........................86 .
Accurate Repair ..................................................... 44
. DIAGNOSTIC PROCEDURE FOR INTAKE
WORK FLOW ..................................................... 44 . DOOR MOTOR ...................................................86 .
SYMPTOM TABLE ............................................. 44 . Blower Motor Circuit ...............................................87 .
Component Parts and Harness Connector Location 45 ... INSPECTION FLOW ...........................................87 .
ENGINE COMPARTMENT ................................. 45 . SYSTEM DESCRIPTION ....................................88 .
PASSENGER COMPARTMENT ......................... 46 . COMPONENT DESCRIPTION ...........................90 .
Schematic .............................................................. 47
. DIAGNOSTIC PROCEDURE FOR BLOWER
Wiring Diagram --A/C--/With A/T (Up To Serial MOTOR ...............................................................90.
329287*) ................................................................ 48
. COMPONENT INSPECTION ..............................92 .
Wiring Diagram --A/C--/With A/T (From Serial Magnet Clutch Circuit .............................................93 .
329288*) and With M/T .......................................... 53 . INSPECTION FLOW ...........................................93 .
Auto Amp. Terminals and Reference Value ........... 58 . SYSTEM DESCRIPTION ....................................94 .
PIN CONNECTOR TERMINAL LAYOUT ........... 58 . DIAGNOSTIC PROCEDURE FOR MAGNET
TERMINALS AND REFERENCE VALUE FOR CLUTCH .............................................................94 .
DISPLAY AND A/C AUTO AMP. ......................... 58 . COMPONENT INSPECTION ............................ 103 .
Self-diagnosis Function ......................................... 61 . Insufficient Cooling ............................................... 104 .
DESCRIPTION ................................................... 61 . INSPECTION FLOW ......................................... 104 .
FUNCTION CONFIRMATION PROCEDURE ..... 62 . PERFORMANCE TEST DIAGNOSES ............. 106 .
AUXILIARY MECHANISM: TEMPERATURE PERFORMANCE CHART ................................. 108 .
SETTING TRIMMER .......................................... 68 . TROUBLE DIAGNOSES FOR UNUSUAL PRES-
AUXILIARY MECHANISM: FOOT POSITION SURE ................................................................ 110
.
SETTING TRIMMER .......................................... 69 . DIAGNOSTIC PROCEDURE FOR INSUFFI-
AUXILIARY MECHANISM: INLET PORT MEM- CIENT COOLING .............................................. 112 .
ORY FUNCTION ................................................ 69 . Insufficient Heating .............................................. 114 .
Operational Check ................................................. 70 . INSPECTION FLOW ......................................... 114 .
CHECKING MEMORY FUNCTION .................... 70 . Noise .................................................................... 116
.
CHECKING BLOWER ........................................ 70 . INSPECTION FLOW ......................................... 116 .
CHECKING DISCHARGE AIR ........................... 70 . Self-diagnosis ...................................................... 117.
CHECKING RECIRCULATION ........................... 71 . INSPECTION FLOW ......................................... 117 .
CHECKING TEMPERATURE DECREASE ........ 71 . Memory Function ................................................. 118 .
CHECKING TEMPERATURE INCREASE ......... 71 . INSPECTION FLOW ......................................... 118 .
CHECK A/C SWITCH ......................................... 71 . Ambient Sensor Circuit ........................................ 118 .
CHECKING AUTO.ECON MODE ....................... 72 . COMPONENT DESCRIPTION ......................... 118 .
Power Supply and Ground Circuit for Auto Amp. ... 72 AMBIENT TEMPERATURE INPUT PROCESS . 119
INSPECTION FLOW .......................................... 72 . DIAGNOSTIC PROCEDURE FOR AMBIENT
COMPONENT DESCRIPTION ........................... 73 . SENSOR ........................................................... 119 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 73 ... COMPONENT INSPECTION ............................ 120 .
LAN System Circuit ............................................... 75 . In-vehicle Sensor Circuit ...................................... 121 .
DIAGNOSTIC PROCEDURE FOR LAN CIR- COMPONENT DESCRIPTION ......................... 121 .
CUIT ................................................................... 75
. DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
Mode Door Motor Circuit ....................................... 78 . SENSOR ........................................................... 122 .
INSPECTION FLOW .......................................... 78 . COMPONENT INSPECTION ............................ 123 .
SYSTEM DESCRIPTION ................................... 79 . Sunload Sensor Circuit ........................................ 123 .
COMPONENT DESCRIPTION ........................... 80 . COMPONENT DESCRIPTION ......................... 123 .
Revision; 2004 April ATC-2 2003 G35 Sedan
SUNLOAD INPUT PROCESS ......................... 124 . REMOVAL ........................................................ 143 .
DIAGNOSTIC PROCEDURE FOR SUNLOAD INSTALLATION ................................................ 144 . A
SENSOR .......................................................... 124 . Disassembly and Assembly ................................. 145 .
COMPONENT INSPECTION ........................... 126 . MODE DOOR MOTOR ........................................... 147 .
Intake Sensor Circuit ........................................... 127 . Removal and Installation ..................................... 147 . B
COMPONENT DESCRIPTION ........................ 127 . REMOVAL ........................................................ 147 .
DIAGNOSTIC PROCEDURE FOR INTAKE SEN- INSTALLATION ................................................ 147 .
SOR ................................................................. 127
. AIR MIX DOOR MOTOR ........................................ 148 .
COMPONENT INSPECTION ........................... 128 . Removal and Installation ..................................... 148 . C
Multiplex Communication Circuit ......................... 129 . REMOVAL ........................................................ 148 .
DIAGNOSTIC PROCEDURE FOR MULTIPLEX INSTALLATION ................................................ 148 .
COMMUNICATION .......................................... 129 . DUCTS AND GRILLES .......................................... 149 . D
A/C AND AUDIO CONTROLLER .......................... 131 . Removal and Installation ..................................... 149 .
Removal and Installation ..................................... 131 . REMOVAL ........................................................ 149 .
REMOVAL ........................................................ 131 . INSTALLATION ................................................ 151 . E
INSTALLATION ................................................ 131 . REFRIGERANT LINES .......................................... 152 .
Disassembly and Assembly ................................ 131 . HFC-134a (R-134a) Service Procedure .............. 152 .
AUTO AMP ............................................................ 132 . SETTING OF SERVICE TOOLS AND EQUIP-
Removal and Installation of Display and A/C Auto MENT ............................................................... 152
. F
Amp. .................................................................... 132
. Components ........................................................ 154 .
REMOVAL ........................................................ 132 . Removal and Installation of Compressor ............. 154 .
INSTALLATION ................................................ 132 . REMOVAL ........................................................ 154 . G
Disassembly and Assembly ................................ 132 . INSTALLATION ................................................ 155 .
AMBIENT SENSOR ............................................... 133 . Removal and Installation of Compressor Clutch . 156
Removal and Installation ..................................... 133 . REMOVAL ........................................................ 156 . H
REMOVAL ........................................................ 133 . INSTALLATION ................................................ 158 .
INSTALLATION ................................................ 133 . Removal and Installation of Low-pressure Flexible
IN-VEHICLE SENSOR ........................................... 134 . Hose .................................................................... 159
.
I
Removal and Installation ..................................... 134 . REMOVAL ........................................................ 159 .
REMOVAL ........................................................ 134 . INSTALLATION ................................................ 159 .
INSTALLATION ................................................ 134 . Removal and Installation of High-pressure Flexible
SUNLOAD SENSOR ............................................. 135 . Hose .................................................................... 160
. ATC
Removal and Installation ..................................... 135 . REMOVAL ........................................................ 160 .
REMOVAL ........................................................ 135 . INSTALLATION ................................................ 160 .
INSTALLATION ................................................ 135 . Removal and Installation of Low-pressure Pipe 1 K
INTAKE SENSOR .................................................. 136 . (Engine Compartment) ........................................ 161 .
Removal and Installation ..................................... 136 . REMOVAL ........................................................ 161 .
REMOVAL ........................................................ 136 . INSTALLATION ................................................ 161 . L
INSTALLATION ................................................ 137 . Removal and Installation of High-pressure Pipe 1
BLOWER UNIT ...................................................... 138 . (Engine Compartment) ........................................ 162 .
Removal and Installation ..................................... 138 . REMOVAL ........................................................ 162 .
REMOVAL ........................................................ 138 . INSTALLATION ................................................ 162 . M
INSTALLATION ................................................ 138 . Removal and Installation of Low-pressure Pipe 2
Disassembly and Assembly ................................ 139 . and High-pressure Pipe 2 .................................... 163 .
BLOWER MOTOR ................................................. 140 . REMOVAL ........................................................ 163 .
Removal and Installation ..................................... 140 . INSTALLATION ................................................ 163 .
REMOVAL ........................................................ 140 . Removal and Installation of Liquid Tank .............. 164 .
INSTALLATION ................................................ 140 . REMOVAL ........................................................ 164 .
INTAKE DOOR MOTOR ........................................ 141 . INSTALLATION ................................................ 165 .
Removal and Installation ..................................... 141 . Removal and Installation of Condenser ............... 165 .
REMOVAL ........................................................ 141 . REMOVAL ........................................................ 165 .
INSTALLATION ................................................ 141 . INSTALLATION ................................................ 166 .
IN-CABIN MICROFILTER ...................................... 142 . Removal and Installation of Refrigerant Pressure
Removal and Installation ..................................... 142 . Sensor ................................................................. 166
.
FUNCTION ....................................................... 142 . REMOVAL ........................................................ 166 .
REPLACEMENT TIMING ................................. 142 . INSTALLATION ................................................ 167 .
REPLACEMENT PROCEDURES .................... 142 . Removal and Installation of Evaporator ............... 167 .
HEATER & COOLING UNIT ASSEMBLY ............. 143 . REMOVAL ........................................................ 167 .
Removal and Installation ..................................... 143 . INSTALLATION ................................................ 167 .
Revision; 2004 April ATC-3 2003 G35 Sedan
Removal and Installation of Expansion Valve ...... 168 . DETECTOR ...................................................... 170 .
REMOVAL ........................................................ 168
. CHECKING PROCEDURE ............................... 171 .
INSTALLATION ................................................. 168 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 173 .
Checking for Refrigerant Leaks ........................... 168 . Compressor ......................................................... 173
.
Checking System for Leaks Using the Fluorescent Lubricant .............................................................. 173
.
Leak Detector ...................................................... 169
. Refrigerant ........................................................... 173
.
Dye Injection ........................................................ 169
. Engine Idling Speed ............................................. 173 .
Electronic Refrigerant Leak Detector ................... 170 . Belt Tension ......................................................... 173
.
PRECAUTIONS FOR HANDLING LEAK
Revision; 2004 April ATC-4 2003 G35 Sedan
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" AJS00116
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 (ACR4) (J-39500-INF) and Refrigerant I
Identifier.
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. ATC
q The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precautions must be observed:
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