2007 INFINITI M35 air intake

ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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Revision: 2007 April2007 M35/M45
AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 5
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 5
Precautions Necessary for Steering Wheel Rotation
After Battery Disconnect .......................................... 5
OPERATION PROCEDURE ................................. 5
Precautions for Procedures without Cowl Top Cover ..... 6
Precautions for Working with HFC-134a (R-134a) ..... 6
CONTAMINATED REFRIGERANT ....................... 7
General Refrigerant Precautions .............................. 7
Precautions for Refrigerant Connection ................... 7
ABOUT ONE-TOUCH JOINT ................................ 7
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION .................................................... 10
O-RING AND REFRIGERANT CONNECTION ... 10
Precautions for Servicing Compressor ................... 12
Precautions for Service Equipment ........................ 13
RECOVERY/RECYCLING EQUIPMENT ............ 13
ELECTRICAL LEAK DETECTOR ....................... 13
VACUUM PUMP ................................................. 13
MANIFOLD GAUGE SET .................................... 13
SERVICE HOSES ............................................... 14
SERVICE COUPLERS ........................................ 14
REFRIGERANT WEIGHT SCALE ...................... 14
CHARGING CYLINDER ...................................... 14
Precautions for Leak Detection Dye ....................... 15
IDENTIFICATION ................................................ 15
IDENTIFICATION LABEL FOR VEHICLE ........... 15
PREPARATION ......................................................... 16
Special Service Tools ............................................. 16
HFC-134a (R-134a) Service Tools and Equipment ... 17
Commercial Service Tools ...................................... 19
REFRIGERATION SYSTEM ..................................... 20
Refrigerant Cycle ................................................... 20
REFRIGERANT FLOW ....................................... 20
FREEZE PROTECTION ..................................... 20
Refrigerant System Protection ............................... 20
REFRIGERANT PRESSURE SENSOR ............. 20
PRESSURE RELIEF VALVE ............................... 20Variable Displacement Compressor ....................... 21
GENERAL INFORMATION ................................. 21
DESCRIPTION .................................................... 22
Component Layout ................................................. 25
LUBRICANT .............................................................. 26
Maintenance of Lubricant Quantity in Compressor ... 26
LUBRICANT ........................................................ 26
LUBRICANT RETURN OPERATION .................. 26
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR .................................................. 27
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT ....................... 27
AIR CONDITIONER CONTROL ............................... 29
Description of Air Conditioner LAN Control System ... 29
System Construction .............................................. 29
OPERATION ........................................................ 30
TRANSMISSION DATA AND TRANSMISSION
ORDER ............................................................... 30
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL) ..................................... 31
FAN SPEED CONTROL ...................................... 31
INTAKE DOOR CONTROL ................................. 31
MODE DOOR CONTROL ................................... 31
UPPER VENTILATOR DOOR CONTROL .......... 31
MAGNET CLUTCH CONTROL ........................... 32
SELF-DIAGNOSIS SYSTEM .............................. 32
Description of Control System ................................ 33
Control Operation ................................................... 33
DISPLAY SCREEN .............................................. 33
MULTIFUNCTION SWITCH ................................ 34
DISPLAY SCREEN .............................................. 34
MODE SWITCH (DRIVER SIDE) ........................ 34
MODE SWITCH (PASSENGER SIDE) ................ 34
TEMPERATURE CONTROL SWITCH (POTEN-
TIO TEMPERATURE CONTROL) (DRIVER
SIDE) ................................................................... 34
TEMPERATURE CONTROL SWITCH (POTEN-
TIO TEMPERATURE CONTROL) (PASSEN-
GER SIDE) .......................................................... 34

ATC-2Revision: 2007 April2007 M35/M45 AUTO SWITCH ................................................... 34
DEFROSTER (DEF) SWITCH ............................. 34
UPPER VENT SWITCH ...................................... 34
A/C SWITCH ....................................................... 35
FAN SWITCHES .................................................. 35
OFF SWITCH ...................................................... 35
REAR WINDOW DEFOGGER SWITCH ............. 35
INTAKE SWITCH ................................................. 35
DUAL SWITCH .................................................... 35
Control Operation (Rear Control Switch) ................ 35
AUTO SWITCH ................................................... 35
FAN SWITCH ...................................................... 35
REAR TEMPERATURE CONTROL SWITCH ..... 36
Fail-Safe Function .................................................. 36
Discharge Air Flow ................................................. 37
System Description ................................................. 38
SWITCHES AND THEIR CONTROL FUNCTION ... 38
CAN Communication System Description .............. 39
TROUBLE DIAGNOSIS ............................................ 40
CONSULT-II Function (ECM) .................................. 40
CONSULT-II BASIC OPERATION ....................... 40
DATA MONITOR .................................................. 40
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 40
WORK FLOW ...................................................... 40
SYMPTOM TABLE .............................................. 41
Component Parts and Harness Connector Location ... 42
ENGINE COMPARTMENT .................................. 42
PASSENGER COMPARTMENT .......................... 43
Schematic ............................................................... 44
Wiring Diagram —A/C— ......................................... 46
Auto Amp. Terminals and Reference Value ............ 54
PIN CONNECTOR TERMINAL LAYOUT ............ 54
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ........................ 54
Self-diagnosis Function .......................................... 56
DESCRIPTION .................................................... 56
FUNCTION CONFIRMATION PROCEDURE ...... 57
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 63
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 64
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION ................................................. 64
Operational Check .................................................. 65
CHECKING MEMORY FUNCTION ..................... 65
CHECKING BLOWER ......................................... 65
CHECKING DISCHARGE AIR (MODE SWITCH
AND DEF SWITCH) ............................................ 65
CHECKING DISCHARGE AIR (UPPER VENT
SWITCH) ............................................................. 66
CHECKING INTAKE AIR ..................................... 66
CHECKING TEMPERATURE DECREASE ......... 66
CHECKING TEMPERATURE INCREASE .......... 66
CHECKING A/C SWITCH ................................... 66
CHECKING AUTO MODE ................................... 66
Power Supply and Ground Circuit for Auto Amp. ... 67
INSPECTION FLOW ........................................... 67
COMPONENT DESCRIPTION ............................ 68DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 68
Rear Control Switch Circuit ..................................... 70
DIAGNOSIS PROCEDURE FOR REAR CON-
TROL SWITCH .................................................... 70
LAN System Circuit ................................................. 71
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 71
Mode Door Motor Circuit ......................................... 76
INSPECTION FLOW ............................................ 76
SYSTEM DESCRIPTION ..................................... 77
COMPONENT DESCRIPTION ............................ 78
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ................................................................ 78
Upper Ventilator Door Motor Circuit ........................ 79
INSPECTION FLOW ............................................ 79
SYSTEM DESCRIPTION ..................................... 80
COMPONENT DESCRIPTION ............................ 81
DIAGNOSIS PROCEDURE FOR UPPER VEN-
TILATOR DOOR MOTOR .................................... 81
Air Mix Door Motor Circuit ....................................... 82
INSPECTION FLOW ............................................ 82
SYSTEM DESCRIPTION ..................................... 83
COMPONENT DESCRIPTION ............................ 84
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR ................................................................ 84
Air Mix Door Motor PBR Circuit .............................. 84
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR ....................................................... 84
Intake Door Motor Circuit ........................................ 85
INSPECTION FLOW ............................................ 85
SYSTEM DESCRIPTION ..................................... 86
COMPONENT DESCRIPTION ............................ 87
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ................................................................ 87
Blower Motor Circuit ................................................ 88
INSPECTION FLOW ............................................ 88
SYSTEM DESCRIPTION ..................................... 89
COMPONENT DESCRIPTION ............................ 90
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ................................................................ 90
COMPONENT INSPECTION ............................... 92
Magnet Clutch Circuit .............................................. 93
INSPECTION FLOW ............................................ 93
SYSTEM DESCRIPTION ..................................... 94
DIAGNOSIS PROCEDURE FOR MAGNET
CLUTCH .............................................................. 94
COMPONENT INSPECTION ............................... 97
Insufficient Cooling .................................................. 98
INSPECTION FLOW ............................................ 98
PERFORMANCE TEST DIAGNOSIS ................100
PERFORMANCE CHART ..................................102
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE .................................................................104
DIAGNOSIS PROCEDURE FOR INSUFFI-
CIENT COOLING ...............................................106
Insufficient Heating ...............................................108
INSPECTION FLOW ..........................................108
Noise .....................................................................109
INSPECTION FLOW ..........................................109
Self-diagnosis .......................................................110

ATC-3
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Revision: 2007 April2007 M35/M45 INSPECTION FLOW .......................................... 110
Memory Function ................................................. . 111
INSPECTION FLOW ......................................... . 111
Ambient Sensor Circuit ......................................... 112
COMPONENT DESCRIPTION .......................... 112
AMBIENT TEMPERATURE INPUT PROCESS .. 112
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR ............................................................ 112
COMPONENT INSPECTION ............................. 114
In-vehicle Sensor Circuit ....................................... 115
COMPONENT DESCRIPTION .......................... 115
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR ............................................................ 116
COMPONENT INSPECTION ............................. 117
Sunload Sensor Circuit ......................................... 118
COMPONENT DESCRIPTION .......................... 118
SUNLOAD INPUT PROCESS ........................... 118
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR ............................................................ 118
COMPONENT INSPECTION ............................ 120
Intake Sensor Circuit ............................................ 121
COMPONENT DESCRIPTION ......................... 121
DIAGNOSIS PROCEDURE FOR INTAKE SEN-
SOR .................................................................. 121
COMPONENT INSPECTION ............................ 122
CONTROLLER ....................................................... 123
Removal and Installation of Multifunction Switch . 123
REMOVAL ......................................................... 123
INSTALLATION ................................................. 123
AUTO AMP ............................................................. 124
Removal and Installation of Unified Meter and A/C
Auto Amp. ............................................................ 124
REMOVAL ......................................................... 124
INSTALLATION ................................................. 124
AMBIENT SENSOR ................................................ 125
Removal and Installation ...................................... 125
REMOVAL ......................................................... 125
INSTALLATION ................................................. 125
IN-VEHICLE SENSOR ............................................ 126
Removal and Installation ...................................... 126
REMOVAL ......................................................... 126
INSTALLATION ................................................. 126
SUNLOAD SENSOR .............................................. 127
Removal and Installation ...................................... 127
REMOVAL ......................................................... 127
INSTALLATION ................................................. 127
INTAKE SENSOR ................................................... 128
Removal and Installation ...................................... 128
REMOVAL ......................................................... 128
INSTALLATION ................................................. 128
BLOWER UNIT ....................................................... 129
Removal and Installation ...................................... 129
REMOVAL ......................................................... 129
INSTALLATION ................................................. 129
Disassembly and Assembly ................................. 130
BLOWER MOTOR .................................................. 131
Removal and Installation ...................................... 131
REMOVAL ......................................................... 131
INSTALLATION ................................................. 131INTAKE DOOR MOTOR .........................................132
Removal and Installation ......................................132
REMOVAL .........................................................132
INSTALLATION .................................................132
IN-CABIN MICROFILTER .......................................133
Removal and Installation ......................................133
FUNCTION ........................................................133
REPLACEMENT TIMING ..................................133
REPLACEMENT PROCEDURES .....................133
HEATER & COOLING UNIT ASSEMBLY ...............134
Removal and Installation ......................................134
REMOVAL .........................................................134
INSTALLATION .................................................135
Disassembly and Assembly ..................................137
MODE DOOR MOTOR ............................................139
Removal and Installation ......................................139
REMOVAL .........................................................139
INSTALLATION .................................................139
AIR MIX DOOR MOTOR .........................................140
Removal and Installation ......................................140
REMOVAL .........................................................140
INSTALLATION .................................................140
UPPER VENTILATOR DOOR MOTOR ..................141
Removal and Installation ......................................141
REMOVAL .........................................................141
INSTALLATION .................................................141
HEATER CORE .......................................................142
Removal and Installation ......................................142
REMOVAL .........................................................142
INSTALLATION .................................................142
DUCTS AND GRILLES ...........................................143
Removal and Installation ......................................143
COMPONENT LAYOUT ....................................143
REMOVAL .........................................................145
INSTALLATION .................................................149
REFRIGERANT LINES ...........................................150
HFC-134a (R-134a) Service Procedure ...............150
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................150
Components .........................................................152
VQ35DE ............................................................152
VK45DE .............................................................153
Removal and Installation of Compressor ..............153
REMOVAL .........................................................153
INSTALLATION .................................................156
Check Disc to Pulley Clearance ...........................156
Removal and Installation of Low-pressure Flexible
Hose and Pipe ......................................................157
REMOVAL .........................................................157
INSTALLATION .................................................157
Removal and Installation of High-pressure Flexible
Hose .....................................................................158
REMOVAL .........................................................158
INSTALLATION .................................................159
Removal and Installation of High-pressure Pipe 1
(Engine Compartment) .........................................159
REMOVAL .........................................................159
INSTALLATION .................................................160
Removal and Installation of Low-pressure Pipe 1

ATC-26
LUBRICANT
Revision: 2007 April2007 M35/M45
LUBRICANTPFP:KLG00
Maintenance of Lubricant Quantity in CompressorNJS000G3
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large refrigerant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:

Lack of lubricant: May lead to a seized compressor.

Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
1. CHECK LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?

A/C system works properly.

There is no evidence of a large amount of lubricant leakage.
CAUTION:
If excessive lubricant leakage is noted, never perform the lubricant return operation.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS
1. Start the engine, and set to the following conditions:
–Engine speed: Idling to 1,200 rpm
–A/C switch: ON
–Blower speed: Max. position
–Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).]
–Intake position: Recirculation (REC)
2. Perform lubricant return operation for about 10 minutes.
3. Stop the engine.
>> GO TO 3.
3. CHECK REPLACEMENT PART
Should the compressor be replaced?
YES >> GO TO AT C - 2 7 , "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACE-
MENT" .
NO >> GO TO AT C - 2 7 , "
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACE-
MENT EXCEPT COMPRESSOR" . Name : Nissan A/C System Oil Type S

AIR CONDITIONER CONTROL
ATC-29
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Revision: 2007 April2007 M35/M45
AIR CONDITIONER CONTROLPFP:27500
Description of Air Conditioner LAN Control SystemNJS000G4
The LAN (Local Area Network) system consists of unified meter and A/C amp., mode door motors, air mix
door motors, upper ventilator door motor and intake door motor.
A configuration of these components is shown in the figure below.
System ConstructionNJS000G5
A small network is constructed between the unified meter and A/C amp., mode door motors, air mix door
motors, upper ventilator door motor and intake door motor. The unified meter and A/C amp. and motors are
connected by data transmission lines and motor power supply lines. The LAN network is built through the
ground circuits of each door motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the unified meter and A/C amp. and each door motor.
The following functions are contained in LCUs built into the mode door motors, the air mix door motors, the
upper ventilator door motor and the intake door motor.

Address

Motor opening angle signals

Data transmission

Motor stop and drive decision

Opening angle sensor (PBR function)

Comparison

Decision (Unified meter and A/C amp. indicated value and motor opening angle comparison)
RJIA4016E
RJIA4017E

ATC-30
AIR CONDITIONER CONTROL
Revision: 2007 April2007 M35/M45
OPERATION
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends mode door, air mix door, upper ventilator door and intake door opening angle data to the mode door
motor LCU, air mix door motor LCU, upper ventilator door motor LCU and intake door motor LCU.
The mode door motor, air mix door motors, upper ventilator door motor and intake door motor read their
respective signals according to the address signal. Opening angle indication signals received from the unified
meter and A/C amp. and each of the motor position sensors is compared by the LCUs in each door motor with
the existing decision and opening angles. Subsequently, HOT/COLD, DEF/VENT, OPEN/SHUT and FRE/REC
operation is selected. The new selection data is returned to the unified meter and A/C amp.
TRANSMISSION DATA AND TRANSMISSION ORDER
Unified meter and A/C amp. data is transmitted consecutively to each of the door motors following the form
shown in figure below.
Start:
Initial compulsory signal is sent to each of the door motors.
Address:
Data sent from the unified meter and A/C amp. are selected according to data-based decisions made by the
mode door motor, air mix door motor, upper ventilator door motor and intake door motor.
If the addresses are identical, the opening angle data and error check signals are received by the door motor
LCUs. The LCUs then make the appropriate error decision. If the opening angle data have no error, door con-
trol begins.
If an error exists, the received data are rejected and corrected data received. Finally, door control is based
upon the corrected opening angle data.
Opening angle:
Data that shows the indicated door opening angle of each door motor.
Error Check:
In this procedure, transmitted and received data is checked for errors. Error data are then compiled. The error
check prevents corrupted data from being used by the mode door motor, the air mix door motor, the upper
ventilator door motor and the intake door motor. Error data can be related to the following symptoms.

Malfunction of electrical frequency

Poor electrical connections

Signal leakage from transmission lines

Signal level fluctuation
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AIR CONDITIONER CONTROL
ATC-31
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Revision: 2007 April2007 M35/M45
Stop signal:
At the end of each transmission, a stop operation, in-operation, or internal malfunction message is delivered to
the unified meter and A/C amp. This completes one data transmission and control cycle.
AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
FAN SPEED CONTROL
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
With pressing AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.
MODE DOOR CONTROL
The mode doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature and amount of sunload.
UPPER VENTILATOR DOOR CONTROL
The upper ventilator door is automatically controlled by the mode setting, and amount of sunload.
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ATC-34
AIR CONDITIONER CONTROL
Revision: 2007 April2007 M35/M45
MULTIFUNCTION SWITCH
DISPLAY SCREEN
The operation status of the system is displayed on the screen.
MODE SWITCH (DRIVER SIDE)

Controls the air discharge outlets.

When the DUAL switch indicator is not illuminated, the driver side and passenger side outlets are
switched together.

When the DUAL switch indicator is illuminated, only the driver side outlet is switched.
MODE SWITCH (PASSENGER SIDE)
When the MODE switch (passenger side) is pressed, the DUAL switch indicator illuminates, and only the pas-
senger side outlet is switched.
TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL) (DRIVER SIDE)
The set temperature is Increased or decreased with this switch.
TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL) (PASSENGER
SIDE)

The set temperature is Increased or decreased with this switch.

When the temperature switch is pressed, the DUAL switch indicator will automatically illuminate.
AUTO SWITCH

The compressor, intake doors, air mix doors, mode doors and blower speed are automatically controlled
so that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the
operator.

When pressing AUTO switch, air inlet, air outlet, fan speed, and discharge air temperature are automati-
cally controlled.
DEFROSTER (DEF) SWITCH
Mode doors are set to the defrost position with this switch. Also, intake doors are set to the outside air position,
and compressor turns ON.
UPPER VENT SWITCH

When UPPER VENT switch is ON, UPPER VENT switch indicator turn ON, and upper ventilator door is
automatically controlled.

When DEFROSTER (DEF) switch is ON, upper ventilator door is shut.

When MODE position (driver side) is FOOT or D/F, upper ventilation door is shut.
RJIA4023E