2012 Infiniti G37 Service & Repair Manual
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HAC-1
VENTILATION, HEATER & AIR CONDITIONER
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SECTION HAC
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CONTENTS
HEATER & AIR CONDITIONING CONTROL SYSTEM
AUTOMATIC AIR CONDITIONING
BASIC INSPECTION ................................... 4
DIAGNOSIS AND REPAIR WORKFLOW ......... 4
Work Flow ................................................................ 4
INSPECTION AND ADJUSTMENT .................... 7
WITHOUT PLASMACLUSTER SYSTEM ................... 7
WITHOUT PLASMACLUSTER SYSTEM : De-
scription & Inspection ............................................... 7
WITHOUT PLASMACLUSTER SYSTEM : Tem-
perature Setting Trimmer ......................................... 9
WITHOUT PLASMACLUSTER SYSTEM : Foot
Position Setting Trimmer ........................................ 11
WITHOUT PLASMACLUSTER SYSTEM : Inlet
Port Memory Function ............................................ 12
WITH PLASMACLUSTER SYSTEM ........................ 13
WITH PLASMACLUSTER SYSTEM : Description
& Inspection ........................................................... 13
WITH PLASMACLUSTER SYSTEM : Tempera-
ture Setting Trimmer .............................................. 15
WITH PLASMACLUSTER SYSTEM : Foot Posi-
tion Setting Trimmer ............................................... 16
WITH PLASMACLUSTER SYSTEM : Inlet Port
Memory Function ................................................... 17
WITH PLASMACLUSTER SYSTEM : Exhaust
Gas/Outside Odor Detecting Sensor Sensitivity
Adjustment Function .............................................. 18
WITH PLASMACLUSTER SYSTEM : Auto Intake
Interlocking Movement Change Function ............... 18
SYSTEM DESCRIPTION ............................ 20
COMPRESSOR CONTROL FUNCTION ...........20
Description ............................................................. 20
Fail-safe ................................................................. 20
Component Part Location ...................................... 21
Component Description .......................................... 24
AUTOMATIC AIR CONDITIONING SYSTEM ... 25
WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM ....25
WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Diagram ...................................25
WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Description ...............................26
WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Part Location .....................33
WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Description ........................35
WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM ..........36
WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: System Diagram ...................................................36
WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: System Description ...............................................38
WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Part Location .....................................50
WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Description ........................................52
ACCS (ADVANCE CLIMATE CONTROL
SYSTEM) ........................................................... 54
System Diagram .....................................................54
System Description .................................................54
Component Part Location .......................................56
Component Description ..........................................57
CAN COMMUNICATION SYSTEM ................... 58
System Description .................................................58
Revision: 2013 February 2012 G Sedan
HAC-2
MODE DOOR CONTROL SYSTEM ................. 59
System Diagram .................................................... 59
System Description ................................................ 59
AIR MIX DOOR CONTROL SYSTEM .............. 61
System Diagram .................................................... 61
System Description ................................................ 61
INTAKE DOOR CONTROL SYSTEM ............... 63
System Diagram .................................................... 63
System Description ................................................ 63
BLOWER MOTOR CONTROL SYSTEM ......... 65
System Diagram .................................................... 65
System Description ................................................ 65
MAGNET CLUTCH CONTROL SYSTEM ........ 67
System Diagram .................................................... 67
System Description ................................................ 67
DIAGNOSIS SYSTEM (UNIFIED METER & A/
C AMP.) ............................................................. 69
WITHOUT PLASMACLUSTER SYSTEM ................ 69
WITHOUT PLASMACLUSTER SYSTEM : Diag-
nosis Description ................................................... 69
WITH PLASMACLUSTER SYSTEM ........................ 74
WITH PLASMACLUSTER SYSTEM : Diagnosis
Description ............................................................. 74
DTC/CIRCUIT DIAGNOSIS ........................ 80
POWER SUPPLY AND GROUND CIRCUIT .... 80
UNIFIED METER AND A/C AMP. ............................ 80
UNIFIED METER AND A/C AMP. : Diagnosis Pro-
cedure .................................................................... 80
UNIFIED METER AND A/C AMP. .................... 81
Description ............................................................. 81
Component Function Check .................................. 81
Diagnosis Procedure ............................................. 81
MODE DOOR MOTOR ..................................... 82
Description ............................................................. 82
Component Function Check ................................ 82
Diagnosis Procedure ............................................. 82
AIR MIX DOOR MOTOR ................................... 84
WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM ... 84
WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Description ........................................... 84
WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Function Check ............... 84
WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Diagnosis Procedure ........................... 84
WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM .......... 85
WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Description ........................................................... 85
WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Function Check ............................... 86
WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Diagnosis Procedure ............................................ 86
INTAKE DOOR MOTOR ................................... 89
Description ............................................................. 89
Component Function Check ................................. 89
Diagnosis Procedure .............................................. 89
BLOWER MOTOR ............................................ 91
Description ............................................................. 91
Component Function Check ................................. 91
Diagnosis Procedure .............................................. 91
Component Inspection ........................................... 93
MAGNET CLUTCH ........................................... 95
Description ............................................................. 95
Component Function Check .................................. 95
Diagnosis Procedure .............................................. 95
ECV (ELECTRICAL CONTROL VALVE) ......... 97
Description ............................................................. 97
Diagnosis Procedure .............................................. 97
AMBIENT SENSOR .......................................... 99
Description ............................................................. 99
Component Function Check ................................. 99
Diagnosis Procedure .............................................. 99
Component Inspection ......................................... 100
IN-VEHICLE SENSOR ..................................... 102
Description ........................................................... 102
Component Function Check ............................... 102
Diagnosis Procedure ............................................ 102
Component Inspection ......................................... 103
SUNLOAD SENSOR ....................................... 105
Description ........................................................... 105
Component Function Check ............................... 105
Diagnosis Procedure ............................................ 105
Component Inspection ......................................... 106
INTAKE SENSOR ............................................ 108
Description ........................................................... 108
Component Function Check ............................... 108
Diagnosis Procedure ............................................ 108
Component Inspection ......................................... 109
EXHAUST GAS/OUTSIDE ODOR DETECT-
ING SENSOR ................................................... 110
Description ........................................................... 110
Component Function Check ............................... 110
Diagnosis Procedure ............................................ 110
Revision: 2013 February 2012 G Sedan
HAC-3
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IONIZER .......................................................... 113
Description ........................................................... 113
Component Function Check ................................. 113
Diagnosis Procedure ............................................ 113
ECU DIAGNOSIS INFORMATION ........... 115
UNIFIED METER AND A/C AMP. ................... 115
Reference Value .................................................. 115
Wiring Diagram - AUTOMATIC AIR CONDITION-
ING SYSTEM - ..................................................... 117
Fail-safe ............................................................... 118
ECM ................................................................. 120
VQ37VHR ............................................................... 120
VQ37VHR : Reference Value ............................... 120
VQ25HR FOR USA AND CANADA ....................... 136
VQ25HR FOR USA AND CANADA : Reference
Value .................................................................... 136
VQ25HR FOR MEXICO .......................................... 152
VQ25HR FOR MEXICO : Reference Value ......... 152
SYMPTOM DIAGNOSIS ........................... 169
AUTOMATIC AIR CONDITIONING SYSTEM .. 169
Diagnosis Chart By Symptom .............................. 169
INSUFFICIENT COOLING .............................. 171
Description ........................................................... 171
Inspection procedure ............................................ 171
INSUFFICIENT HEATING ............................... 173
Description ........................................................... 173
Inspection procedure ............................................ 173
NOISE .............................................................. 175
Description ........................................................... 175
Inspection procedure ............................................ 175
SELF-DIAGNOSIS CANNOT BE PER-
FORMED ......................................................... 177
Description ........................................................... 177
Inspection procedure ............................................ 177
MEMORY FUNCTION DOES NOT OPERATE .. 178
Description ........................................................... 178
Inspection procedure ............................................ 178
PRECAUTION ........................................... 179
PRECAUTIONS ............................................... 179
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. 179
REMOVAL AND INSTALLATION ............ 180
PRESET SWITCH ........................................... 180
Exploded View ...................................................... 180
Removal and Installation ...................................... 180
UNIFIED METER AND A/C AMP. ................... 181
Exploded View ...................................................... 181
Removal and Installation ...................................... 181
AMBIENT SENSOR ........................................ 182
Exploded View ...................................................... 182
Removal and Installation ...................................... 182
IN-VEHICLE SENSOR .................................... 183
Exploded View ...................................................... 183
Removal and Installation ...................................... 183
SUNLOAD SENSOR ....................................... 184
Exploded View ...................................................... 184
Removal and Installation ...................................... 184
INTAKE SENSOR ........................................... 185
Exploded View ...................................................... 185
Removal and Installation ...................................... 185
REFRIGERANT PRESSURE SENSOR .......... 186
Exploded View ...................................................... 186
Removal and Installation ...................................... 186
DOOR MOTOR ................................................ 187
Exploded View ...................................................... 187
MODE DOOR MOTOR ............................................ 187
MODE DOOR MOTOR : Removal and Installation .. 187
AIR MIX DOOR MOTOR ......................................... 187
AIR MIX DOOR MOTOR : Removal and Installa-
tion ........................................................................ 188
INTAKE DOOR MOTOR ......................................... 188
INTAKE DOOR MOTOR : Removal and Installa-
tion ........................................................................ 188
EXHAUST GAS/OUTSIDE ODOR DETECT-
ING SENSOR .................................................. 189
Exploded View ...................................................... 189
Removal and Installation ...................................... 189
IONIZER .......................................................... 190
Exploded View ...................................................... 190
Removal and Installation ...................................... 190
Revision: 2013 February 2012 G Sedan
HAC-4
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONING]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000007776207
OVERALL SEQUENCE
DETAILED FLOW
JMIIA2097GB
Revision: 2013 February 2012 G Sedan
DIAGNOSIS AND REPAIR WORKFLOW
HAC-5
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONING]
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1.GET INFORMATION FOR SYMPTOM
1. Get detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurs).
2. Check operation condition of the function that is malfunctioning.
>> GO TO 2.
2.CHECK DTC
1. Check DTC.
2. Perform the following procedure if DTC is detected.
- Record DTC and freeze frame data (Print them out using CONSULT.)
- Erase DTC.
- Study the relationship between the cause detected by DTC and the symptom described by the customer.
3. Check related service bulletins for information.
Are any symptoms described and any DTC detected?
Symptom is described, DTC is detected>>GO TO 3.
Symptom is described, DTC is not detected>>GO TO 4.
Symptom is not described, DTC is detected>>GO TO 7.
3.CONFIRM THE SYMPTOM
Try to confirm the symptom described by the customer.
Also study the normal operation and fail-safe related to the symptom.
Verify relation between the symptom and the condition when the symptom is detected.
>> GO TO 7.
4.CONFIRM THE SYMPTOM
Try to confirm the symptom described by the customer.
Also study the normal operation and fail-safe related to the symptom.
Verify relation between the symptom and the condition when the symptom is detected.
>> GO TO 5.
5.SELF-DIAGNOSIS WITH ON BOARD DIAGNOSIS SYSTEM
Perform the self-diagnosis with on board diagnosis. Check that whether malfunction result is detected or not.
Is malfunction result detected?
YES >> GO TO 6.
NO >> GO TO 8.
6.TROUBLE DIAGNOSIS BY MALFUNCTION
Perform the trouble diagnosis for the detected malfunction result. Specify the malfunctioning part.
>> GO TO 9.
7.PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC CONFIRMATION PROCEDURE for the detected DTC, and then check that DTC is detected
again. At this time, always connect CONSULT to the vehicle, and check self diagnostic results in real time.
If two or more DTCs are detected, refer to DTC INSPECTION PRIORITY CHART, and determine trouble diag-
nosis order.
NOTE:
• Freeze frame data is useful if the DTC is not detected.
• Perform Component Function Check if DTC CONFIRMATION PROCEDURE is not included on Service
Manual. This simplified check procedure is an effective alternative though DTC cannot be detected during
this check.
If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIR-
MATION PROCEDURE.
Is DTC detected?
Revision: 2013 February 2012 G Sedan
HAC-6
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONING]
DIAGNOSIS AND REPAIR WORKFLOW
YES >> GO TO 9.
NO >> Check according to GI-43, " Intermittent Incident " .
8.DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS
Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step
4, and determine the trouble diagnosis order based on possible causes and symptom.
Is the symptom described?
YES >> GO TO 9.
NO >> Monitor input data from related sensors or check voltage of related module terminals using CON-
SULT.
9.DETECT MALFUNCTIONING PART BY DIAGNOSIS PROCEDURE
Inspect according to Diagnosis Procedure of the system.
Is malfunctioning part detected?
YES >> GO TO 10.
NO >> Check according to GI-43, " Intermittent Incident " .
10.REPAIR OR REPLACE THE MALFUNCTIONING PART
1. Repair or replace the malfunctioning part.
2. Reconnect parts or connectors disconnected during Diagnosis Procedure again after repair and replace-
ment.
3. Check DTC. If DTC is detected, erase it.
>> GO TO 11.
11.FINAL CHECK
When DTC is detected in step 2, perform DTC CONFIRMATION PROCEDURE again, and then check that the
malfunction is repaired securely.
When symptom is described by the customer, refer to confirmed symptom in step 3 or 4, and check that the
symptom is not detected.
Is DTC detected and does symptom remain?
YES-1 >> DTC is detected: GO TO 9.
YES-2 >> Symptom remains: GO TO 4.
NO >> Before returning the vehicle to the customer, always erase DTC.
Revision: 2013 February 2012 G Sedan
INSPECTION AND ADJUSTMENT
HAC-7
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONING]
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INSPECTION AND ADJUSTMENT
WITHOUT PLASMACLUSTER SYSTEM
WITHOUT PLASMACLUSTER SYSTEM : Description & Inspection INFOID:0000000007463621
DESCRIPTION
The purpose of the operational check is to check that the individual system operates normally.
INSPECTION PROCEDURE
1.CHECK MEMORY FUNCTION
1. Start the engine.
2. Turn temperature control dial (driver side) clockwise until 32.0°C (90°F) is displayed.
3. Press the OFF switch.
4. Turn the ignition switch OFF.
5. Turn the ignition switch ON.
6. Press the AUTO switch.
7. Check that the temperature setting before turning the ignition switch OFF is stored.
Is the inspection result normal?
YES >> GO TO 2
NO >> Memory function malfunction: HAC-178, " Inspection procedure " .
2.CHECK BLOWER MOTOR SPEED
1. Start the engine.
2. Press fan (UP: +) switch
*1
(turn fan control dial clockwise
*2
). Check that the fan speed is changed. Check
the operation for all fan speeds.
NOTE:
*1: With left and right ventilation temperature separately system.
*2: Without left and right ventilation temperature separately system.
3. Set the fan speed to max speed.
Is the inspection result normal?
YES >> GO TO 3
NO >> Blower motor system malfunction: HAC-91, " Diagnosis Procedure " .
3.CHECK DISCHARGE AIR
1. Press the MODE switch and the DEF switch.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distribution table as follows:
Without rear ventilation
*: With left and right ventilation temperature separately control system.
Conditions : Engine running at normal operating temperature
Discharge air flow
Mode position indication Condition
Air outlet/distribution
VENT
FOOT
DEF
Front Rear
DUAL switch: OFF*
100% — — —
53% 29% 18% —
11% 39% 24% 26%
9% 33% 21% 37%
16% — — 84%
Revision: 2013 February 2012 G Sedan
HAC-8
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONING]
INSPECTION AND ADJUSTMENT
With rear ventilation
*: With left and right ventilation temperature separately control system.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and the intake door position is at
FRE when D/F or DEF is selected.
Is the inspection result normal?
YES >> GO TO 4
NO >> Mode door system malfunction: HAC-82, " Diagnosis Procedure " .
4.CHECK INTAKE AIR
1. Press intake switch. REC indicator turns ON.
2. Press intake switch again. FRE indicator turns ON.
3. Listen for intake door position change. (Slight change of blower sound can be heard.)
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and the intake door position is at
FRE when D/F or DEF is selected.
Is the inspection result normal?
YES >> GO TO 5
NO >> Intake door system malfunction: HAC-89, " Diagnosis Procedure " .
5.CHECK A/C SWITCH
1. Press the A/C switch.
2. A/C switch indicator turns ON.
Confirm that the compressor clutch engages (sound or visual inspection).
Is the inspection result normal?
YES >> GO TO 6
NO >> Magnet clutch system malfunction: HAC-95, " Diagnosis Procedure " .
6.CHECK WITH TEMPERATURE SETTING LOWERED
1. Turn temperature control dial (driver side) counterclockwise until 18°C (64°F) is displayed.
2. Check that the cool air blows from the outlets.
Is the inspection result normal?
YES >> GO TO 7
NO >> Insufficient cooling: HAC-171, " Inspection procedure " .
7.CHECK WITH TEMPERATURE SETTING RAISED
1. Turn temperature control dial (driver side) clockwise until 32°C (90°F) is displayed.
2. Check that the warm air blows from the outlets.
Is the inspection result normal?
YES-1 >> With left and right ventilation temperature separately system. GO TO 8
YES-2 >> Without left and right ventilation temperature separately system. GO TO 9
NO >> Insufficient heating: HAC-173, " Inspection procedure " .
8.CHECK LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM FUNC-
TION
Discharge air flow
Mode position indication Condition
Air outlet/distribution
VENT FOOT
DEF
Front Rear Front Rear
DUAL switch: OFF*
Rear ventilator: OPEN
88% 12% — — —
49% 10% 25% 16% —
10% 12% 33% 22% 23%
9% 11% 29% 18% 33%
15% — — — 85%
Revision: 2013 February 2012 G Sedan
INSPECTION AND ADJUSTMENT
HAC-9
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONING]
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1. Press the DUAL switch, and then check that “DUAL” is shown on the display.
2. Operate temperature control dial (driver side). Check that the discharge air temperature (driver side)
changes.
3. Operate the temperature control dial (passenger side). Check that the discharge air temperature (passen-
ger side) changes.
4. Press the DUAL switch, and then check that the temperature setting (LH/RH) is unified to the driver side
temperature setting.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Refer to HAC-169, " Diagnosis Chart By Symptom " and perform the appropriate diagnosis.
9.CHECK AUTO MODE
1. Press the AUTO switch, and then check that “AUTO” is shown on the display.
2. Check that the discharge air and fan speed depend on ambient temperature, in-vehicle temperature and
temperature setting.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Refer to HAC-169, " Diagnosis Chart By Symptom " and perform the appropriate diagnosis.
WITHOUT PLASMACLUSTER SYSTEM : Temperature Setting Trimmer INFOID:0000000007463622
DESCRIPTION
The trimmer compensates for differences in range of ±3°C (±6°F) between temperature setting (displayed dig-
itally) and temperature felt by customer.
Operating procedures for this trimmer are as per the following:
1. Begin self-diagnosis STEP-5 mode. Refer to HAC-69, " WITHOUT PLASMACLUSTER SYSTEM : Diagno-
sis Description " .
2. Press fan (UP: +) switch
*1
(turn fan control dial clockwise
*2
) to set system in auxiliary mode.
NOTE:
*1: With left and right ventilation temperature separately system.
*2: Without left and right ventilation temperature separately system.
3. Display shows “61” in auxiliary mechanism. It takes approximately 3 seconds to enable setting operation.
4. Turn temperature control dial (driver side) as desired. Temperature will change at a rate of 0.5°C (1.0°F)
each time a dial is turned.
CAUTION:
A decimal point is not indicated on the display.
Revision: 2013 February 2012 G Sedan
HAC-10
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONING]
INSPECTION AND ADJUSTMENT
Without left and right ventilation temperrature separately system
JMIIA2118GB
Revision: 2013 February 2012 G Sedan
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Offline Viewing
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$36.99
The 2012 Infiniti G37 Service & Repair Manual is a comprehensive guide suitable for both professional mechanics and DIY enthusiasts. It is designed to assist in maintaining and repairing Infiniti G37 vehicles, covering a range of models such as the Base Sedan, Journey Sedan, Sport Appearance Edition Sedan, G37x Sedan, Base Coupe, Journey Coupe, Sport 6MT Coupe, G37x Coupe, and IPL Coupe.
This manual provides detailed instructions and diagrams, offering step-by-step procedures for routine maintenance, troubleshooting, and repairs on various components of the Infiniti G37. Whether it's changing the oil, replacing brake pads, or diagnosing electrical issues, this manual serves as a valuable resource for anyone working on their G37.
By following the instructions outlined in this manual, owners and mechanics can ensure the longevity and reliability of their 2012 Infiniti G37 vehicles.
