HAC-1
VENTILATION, HEATER & AIR CONDITIONER
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SECTION HAC
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CONTENTS
HEATER & AIR CONDITIONING CONTROL SYSTEM
AUTOMATIC AIR CONDITIONER
BASIC INSPECTION ................................... 4
DIAGNOSIS AND REPAIR WORKFLOW ......... 4
How to Perform Trouble Diagnosis For Quick And
Accurate Repair ....................................................... 4
INSPECTION AND ADJUSTMENT .................... 5
Operational Check (Front) ........................................ 5
Operational Check (Rear) ........................................ 6
FUNCTION DIAGNOSIS .............................. 8
FUNCTION INFORMATION ............................... 8
Component Part Location ........................................ 8
Symptom Table ...................................................... 11
REFRIGERATION SYSTEM .............................13
Refrigerant Cycle ................................................... 13
Refrigerant System Protection ............................... 13
AUTOMATIC AIR CONDITIONER SYSTEM ....15
Control System Diagram ........................................ 15
Control System Description .................................... 15
Discharge Air Flow (Front) ..................................... 18
Switches And Their Control Function (Front) ......... 19
Switches And Their Control Function (Rear) .......... 20
DIAGNOSIS SYSTEM (HVAC) .........................21
CONSULT-III Function (HVAC) .............................. 21
DIAGNOSIS SYSTEM (BCM) ...........................22
CONSULT-III Function (BCM - COMMON ITEM) .... 22
CONSULT-III Function (BCM - AIR CONDITION-
ER) ......................................................................... 23
SELF-DIAGNOSIS FUNCTION .........................24
A/C Auto Amp. Self-Diagnosis ............................... 24
A/C and AV Switch Assembly Self-Diagnosis ........ 24
A/C System Self-Diagnosis Code Chart ................. 25
COMPONENT DIAGNOSIS ........................ 26
MODE DOOR MOTOR ...................................... 26
System Description .................................................26
Mode Door Motor (Front) Component Function
Check .....................................................................27
Mode Door Motor (Front) Diagnosis Procedure .....27
AIR MIX DOOR MOTOR ................................... 31
System Description .................................................31
Air Mix Door Motor (Driver) Component Function
Check .....................................................................32
Air Mix Door Motor (Driver) Diagnosis Procedure ....33
Air Mix Door Motor (Passenger) Component
Function Check .......................................................36
Air Mix Door Motor (Passenger) Diagnosis Proce-
dure ........................................................................36
INTAKE DOOR MOTOR ................................... 40
System Description .................................................40
Intake Door Motor Component Function Check .....41
Intake Door Motor Diagnosis Procedure ................41
BLOWER MOTOR CONTROL SYSTEM .......... 43
System Description .................................................43
Front Blower Motor Component Function Check .... 44
Front Blower Motor Diagnosis Procedure ...............44
Front Blower Motor Component Inspection ............48
Rear Blower Motor Description ...............................49
Rear Blower Motor Component Function Check ....50
Rear Air Control (Front) Diagnosis Procedure #1....51
Rear Air Control (Rear) Diagnosis Procedure #2 ....52
Rear Air Control (Rear) Diagnosis Procedure #3 ....53
Rear Air Control (Rear) Diagnosis Procedure #4 ....56
Rear Blower Motor And Relay Component Inspec-
tion ..........................................................................57
REAR AIR CONTROL SYSTEM ....................... 59
Rear Air Control System Description ......................59
Rear Air Control Component Function Check ........59
Rear Air Control (Front) Diagnosis Procedure ........60
Rear Air Control (Rear) Diagnosis Procedure ........62
MAGNET CLUTCH ........................................... 65
Revision: July 2009 2010 Pathfinder
HAC-2
System Description ................................................ 65
Magnet Clutch Component Function Check .......... 65
Magnet Clutch Diagnosis Procedure ..................... 65
WATER VALVE CIRCUIT ................................. 70
Water Valve Description (VK56DE) ....................... 70
Water Valve Diagnosis Procedure (VK56DE) ........ 70
HEATER PUMP ................................................ 72
System Description (VQ40DE) .............................. 72
Diagnosis Procedure (VQ40DE) ............................ 72
Component Inspection (VQ40DE) ......................... 74
AMBIENT SENSOR .......................................... 75
Component Description ......................................... 75
Ambient Sensor Diagnosis Procedure ................... 75
Ambient Sensor Component Inspection ................ 76
IN-VEHICLE SENSOR ...................................... 78
Component Description ......................................... 78
In-Vehicle Sensor Diagnosis Procedure ................ 78
In-Vehicle Sensor Component Inspection ............. 80
OPTICAL SENSOR .......................................... 81
Component Description ......................................... 81
Optical Sensor Diagnosis Procedure ..................... 81
INTAKE SENSOR ............................................. 83
System Description ................................................ 83
Intake Sensor Diagnosis Procedure ...................... 83
Intake Sensor Component Inspection ................... 84
POWER SUPPLY AND GROUND CIRCUIT
FOR CONTROLLER ......................................... 86
Component Description ......................................... 86
A/C Auto Amp. Component Function Check ......... 86
A/C Auto Amp Power and Ground Diagnosis Pro-
cedure .................................................................... 87
ECU DIAGNOSIS ....................................... 88
AIR CONDITIONER CONTROL ....................... 88
A/C Auto Amp. Terminals Reference Values ........ 88
Wiring Diagram ...................................................... 90
SYMPTOM DIAGNOSIS ........................... 106
AIR CONDITIONER CONTROL ..................... 106
Symptom Matrix Chart ........................................ 106
INSUFFICIENT COOLING .............................. 107
Component Function Check ................................. 107
Diagnostic Work Flow ........................................... 108
Performance Chart ............................................... 110
Trouble Diagnoses for Abnormal Pressure .......... 111
INSUFFICIENT HEATING .............................. 115
Component Function Check ................................. 115
NOISE ............................................................. 117
Component Function Check ................................. 117
MEMORY FUNCTION DOES NOT OPERATE .. 119
Memory Function Check ...................................... 119
PRECAUTION ........................................... 120
PRECAUTIONS ............................................... 120
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. 120
Working with HFC-134a (R-134a) ........................ 120
Precaution for Service Equipment ....................... 121
MANUAL AIR CONDITIONER
BASIC INSPECTION ................................. 122
DIAGNOSIS AND REPAIR WORKFLOW ....... 122
How to Perform Trouble Diagnosis For Quick And
Accurate Repair ................................................... 122
INSPECTION AND ADJUSTMENT ................. 123
Operational Check ............................................... 123
FUNCTION DIAGNOSIS ........................... 125
FUNCTION INFORMATION ............................ 125
Component Part Location .................................... 125
Symptom Table .................................................... 127
REFRIGERATION SYSTEM ............................ 128
Refrigerant Cycle ................................................. 128
Refrigerant System Protection ............................. 128
MANUAL AIR CONDITIONER SYSTEM ........ 130
Control System Diagram ...................................... 130
Control System Description ................................. 130
Discharge Air Flow ............................................... 132
Switches And Their Control Function ................... 132
DIAGNOSIS SYSTEM (BCM) .......................... 134
CONSULT-III Function (BCM - COMMON ITEM) . 134
CONSULT-III Function (BCM - AIR CONDITION-
ER) ....................................................................... 135
COMPONENT DIAGNOSIS ...................... 136
MODE DOOR MOTOR .................................... 136
System Description .............................................. 136
Mode Door Motor (Front) Component Function
Check ................................................................... 136
Mode Door Motor (Front) Diagnosis Procedure ... 137
AIR MIX DOOR MOTOR ................................. 139
System Description .............................................. 139
Air Mix Door Motor Component Function Check . 140
Air Mix Door Motor Diagnosis Procedure ............. 140
INTAKE DOOR MOTOR .................................. 143
System Description .............................................. 143
Intake Door Motor Component Function Check ... 143
Intake Door Motor Diagnosis Procedure .............. 144
BLOWER MOTOR ........................................... 146
Revision: July 2009 2010 Pathfinder
HAC-3
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System Description .............................................. 146
Front Blower Motor Component Function Check .. 146
Front Blower Motor Diagnosis Procedure ............ 147
Front Blower Motor Component Inspection .......... 150
MAGNET CLUTCH .......................................... 153
System Description .............................................. 153
Magnet Clutch Component Function Check ........ 153
Magnet Clutch Diagnosis Procedure .................... 153
INTAKE SENSOR ........................................... 157
System Description .............................................. 157
Intake Sensor Diagnosis Procedure ..................... 157
Intake Sensor Component Inspection .................. 158
POWER SUPPLY AND GROUND CIRCUIT
FOR CONTROLLER ....................................... 160
Component Description ........................................ 160
Front Air Control Component Function Check ..... 160
Front Air Control Power and Ground Diagnosis
Procedure ............................................................. 160
ECU DIAGNOSIS ...................................... 162
AIR CONDITIONER CONTROL ...................... 162
System Description .............................................. 162
System Operation ................................................ 162
Front Air Control Terminals Reference Values .... 163
Wiring Diagram ..................................................... 165
SYMPTOM DIAGNOSIS ........................... 172
AIR CONDITIONER CONTROL ...................... 172
Symptom Matrix Chart ........................................ 172
INSUFFICIENT COOLING .............................. 173
Component Function Check ................................. 173
Diagnostic Work Flow ........................................... 174
Performance Chart ............................................... 176
Trouble Diagnoses for Abnormal Pressure .......... 177
INSUFFICIENT HEATING ............................... 181
Component Function Check ................................. 181
NOISE .............................................................. 183
Component Function Check ................................. 183
PRECAUTION ........................................... 185
PRECAUTIONS ............................................... 185
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. 185
Working with HFC-134a (R-134a) ........................ 185
Precaution for Service Equipment ........................ 186
Revision: July 2009 2010 Pathfinder
HAC-4
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
How to Perform Trouble Diagnosis For Quick And Accurate Repair INFOID:0000000005256899
WORK FLOW
1.LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. Get detailed information about the conditions and environment when the symp-
tom occurs.
>> GO TO 2
2.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
3.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to HAC-123, " Operational Check " .
Can a symptom be duplicated?
YES >> GO TO 4
NO >> GO TO 5
4.GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis. Refer to HAC-172, " Symptom Matrix Chart " .
Can a symptom be duplicated?
>> GO TO 5.
5.PERFORM THE A/C AUTO AMP SELF-DIAGNOSIS
Perform A/C auto amp. self-diagnosis. Refer to HAC-24, " A/C Auto Amp. Self-Diagnosis " .
>> If any diagnostic trouble codes set. Refer to HAC-25, " A/C System Self-Diagnosis Code Chart " .
>> Confirm the repair by performing operational check. Refer to HAC-123, " Operational Check " .
Revision: July 2009 2010 Pathfinder
INSPECTION AND ADJUSTMENT
HAC-5
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONER]
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INSPECTION AND ADJUSTMENT
Operational Check (Front) INFOID:0000000005256900
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1. Set the temperature to 32°C (90°F).
2. Press the OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Press the OFF switch.
If NG, go to trouble diagnosis procedure for HAC-119, " Memory Function Check " .
If OK, continue with next check.
CHECKING BLOWER
1. Press the blower speed control switch (+) once, blower should operate on low speed. The fan display
should have one bar lit (on display).
2. Press the blower speed control switch (+) again, and continue checking blower speed and fan display until
all speeds are checked.
3. Leave blower on maximum speed.
If NG, go to trouble diagnosis procedure for HAC-147, " Front Blower Motor Diagnosis Procedure " .
If OK, continue with next check.
CHECKING DISCHARGE AIR
1. Press MODE switch four times and the DEF switch.
2. Each position indicator should change shape (on display).
3. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-18, " Discharge
Air Flow (Front) " .
Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for HAC-137, " Mode Door Motor (Front) Diagnosis Procedure " .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at
fresh when the FOOT, DEF or D/F is selected.
CHECKING RECIRCULATION ( , ONLY)
1. Press recirculation ( ) switch one time. Recirculation indicator should illuminate.
2. Press recirculation ( ) switch one more time. Recirculation indicator should go off.
3. Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for HAC-144, " Intake Door Motor Diagnosis Procedure " .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the FOOT, DEF or D/F is selected. REC ( ) is not allowed in DEF ( ) D/F ( ) or FOOT ( ).
CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial (drive or passenger) counterclockwise until 18°C (60°F) is displayed.
2. Check for cold air at appropriate discharge air outlets.
Conditions : Engine running and at normal operating temperature
Revision: July 2009 2010 Pathfinder
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2010 Nissan Pathfinder Service & Repair Manual
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Description
- This repair manual provides troubleshooting and replacement procedures recommended by the manufacturer, including step-by-step instructions, clear images, and exploded-view illustrations.
- It is useful for both professional mechanics and DIY enthusiasts for maintaining and repairing the 2010 Nissan Pathfinder.
- Regular maintenance is essential for the vehicle's durability, and this manual offers the necessary information to address wear and tear over time.
- It eliminates the hassle of searching through numerous pages and offers the convenience of digital access, allowing for easy navigation, searching, and bookmarking.
- It is available in English and compatible with various electronic devices, including PCs, Mac computers, smartphones, and tablets. Adobe Reader is required for viewing and printing.
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