HAC-1
VENTILATION, HEATER & AIR CONDITIONER
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CONTENTS
HEATER & AIR CONDITIONING CONTROL SYSTEM
AUTOMATIC AIR CONDITIONER
BASIC INSPECTION ................................... 4
DIAGNOSIS AND REPAIR WORKFLOW ......... 4
Work Flow ................................................................ 4
INSPECTION AND ADJUSTMENT .................... 5
Description and Conditions ...................................... 5
Operational Check ................................................... 5
Auxiliary Mechanism Trimmers ................................ 6
FUNCTION DIAGNOSIS .............................. 9
FUNCTION INFORMATION ............................... 9
Component Part Location ........................................ 9
Component’s Role .................................................. 11
REFRIGERATION SYSTEM .............................13
Refrigerant Cycle ................................................... 13
Refrigerant System Protection ............................... 13
AUTOMATIC AIR CONDITIONER SYSTEM ....14
System Diagram ..................................................... 14
System Description ................................................ 14
Component Part Location ...................................... 20
Component Description .......................................... 20
DIAGNOSIS SYSTEM (ECM) ............................21
CONSULT-III Function ........................................... 21
SELF-DIAGNOSIS FUNCTION .........................22
Diagnosis Description ............................................ 22
Auxiliary Mechanism Trimmers .............................. 27
COMPONENT DIAGNOSIS ........................ 28
LAN SYSTEM CIRCUIT ....................................28
Description ............................................................. 28
Diagnosis Procedure .............................................. 28
MODE DOOR MOTOR ......................................31
Description ............................................................. 31
Diagnosis Procedure ..............................................32
AIR MIX DOOR MOTOR ................................... 33
Description ..............................................................33
Diagnosis Procedure ..............................................34
INTAKE DOOR MOTOR ................................... 35
Description ..............................................................35
Diagnosis Procedure ..............................................36
BLOWER MOTOR ............................................ 37
Description ..............................................................37
Component Function Check ...................................38
Diagnosis Procedure ..............................................38
MAGNET CLUTCH ........................................... 43
Description ..............................................................43
Component Function Check ...................................43
Diagnosis Procedure ..............................................43
AMBIENT SENSOR .......................................... 47
Description ..............................................................47
Diagnosis Procedure ..............................................47
Component Inspection ............................................48
IN-VEHICLE SENSOR ...................................... 50
Component Description ..........................................50
Diagnosis Procedure ..............................................50
Component Inspection ............................................52
SUNLOAD SENSOR ......................................... 53
Description ..............................................................53
Diagnosis Procedure ..............................................53
Component Inspection ............................................55
INTAKE SENSOR ............................................. 56
Description ..............................................................56
Diagnosis Procedure ..............................................56
Component Inspection ............................................57
POWER SUPPLY AND GROUND CIRCUIT
FOR FRONT AIR CONTROL ............................ 58
Description ..............................................................58
Revision: September 2009 2010 Altima
HAC-2
Component Function Check .................................. 58
Diagnosis Procedure ............................................. 58
ECU DIAGNOSIS ....................................... 60
AIR CONDITIONER CONTROL ....................... 60
Reference Value .................................................... 60
WIRING DIAGRAM .................................... 62
AIR CONDITIONER CONTROL ....................... 62
COUPE ..................................................................... 62
COUPE : Wiring Diagram - Air Conditioner Control
(Auto) - Coupe ....................................................... 62
SEDAN ..................................................................... 71
SEDAN : Wiring Diagram - Air Conditioner Control
(Auto) - Sedan ....................................................... 72
SYMPTOM DIAGNOSIS ............................ 82
AIR CONDITIONER CONTROL ....................... 82
Symptom Matrix Chart ......................................... 82
INSUFFICIENT COOLING ................................ 83
Component Function Check .................................. 83
Diagnostic Work Flow ............................................ 84
Performance Chart ................................................ 86
Trouble Diagnosis For Abnormal Pressure ............ 87
INSUFFICIENT HEATING ................................ 91
Component Function Check .................................. 91
NOISE ............................................................... 93
Component Function Check .................................. 93
SELF-DIAGNOSIS CANNOT BE PER-
FORMED ........................................................... 95
Diagnosis Procedure ............................................. 95
MEMORY FUNCTION DOES NOT OPERATE ... 96
Diagnosis Procedure ............................................. 96
PRECAUTION ............................................ 97
PRECAUTIONS ................................................ 97
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ................................................................ 97
Working with HFC-134a (R-134a) ......................... 97
Precaution for Service Equipment ......................... 98
MANUAL AIR CONDITIONER
BASIC INSPECTION .................................. 99
DIAGNOSIS AND REPAIR WORKFLOW ........ 99
Work Flow .............................................................. 99
INSPECTION AND ADJUSTMENT ................ 100
Description & Conditions ...................................... 100
Operational Check ................................................ 100
FUNCTION DIAGNOSIS ........................... 102
FUNCTION INFORMATION ............................ 102
Component Part Location .................................... 102
Component’s Role ............................................... 104
AIR CONDITIONER CONTROL ...................... 105
System Diagram .................................................. 105
System Description .............................................. 105
Component Part Location .................................... 111
Component Description ....................................... 111
DIAGNOSIS SYSTEM (ECM) .......................... 112
CONSULT-III Function ......................................... 112
COMPONENT DIAGNOSIS ...................... 113
LAN SYSTEM CIRCUIT .................................. 113
Description ........................................................... 113
Diagnosis Procedure ............................................ 113
MODE DOOR MOTOR .................................... 116
Description ........................................................... 116
Diagnosis Procedure ............................................ 117
AIR MIX DOOR MOTOR ................................. 118
Description ........................................................... 118
Diagnosis Procedure ............................................ 119
INTAKE DOOR MOTOR .................................. 120
Description ........................................................... 120
Diagnosis Procedure ............................................ 120
BLOWER MOTOR ........................................... 122
Description ........................................................... 122
Component Function Check ................................ 122
Diagnosis Procedure ............................................ 122
MAGNET CLUTCH .......................................... 127
Component Function Check ................................ 127
Diagnosis Procedure ............................................ 127
POWER SUPPLY AND GROUND CIRCUIT
FOR FRONT AIR CONTROL .......................... 130
Description ........................................................... 130
Component Function Check ................................ 130
Diagnosis Procedure ............................................ 130
ECU DIAGNOSIS ...................................... 132
AIR CONDITIONER CONTROL ...................... 132
Reference Value .................................................. 132
WIRING DIAGRAM ................................... 134
AIR CONDITIONER CONTROL ...................... 134
COUPE ................................................................... 134
COUPE : Wiring Diagram - Air Conditioner Control
(Manual) - Coupe ................................................. 134
SEDAN ................................................................... 141
Revision: September 2009 2010 Altima
HAC-3
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SEDAN : Wiring Diagram - Air Conditioner Control
(Manual) - Sedan ................................................. 142
SYMPTOM DIAGNOSIS ........................... 150
AIR CONDITIONER CONTROL ...................... 150
Symptom Matrix Chart ........................................ 150
INSUFFICIENT COOLING .............................. 151
Component Function Check ................................. 151
Diagnostic Work Flow .......................................... 152
Performance Chart ............................................... 154
Trouble Diagnosis For Abnormal Pressure .......... 155
INSUFFICIENT HEATING ............................... 159
Component Function Check ................................. 159
NOISE .............................................................. 161
Component Function Check ................................. 161
PRECAUTION ........................................... 163
PRECAUTIONS ............................................... 163
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. 163
Working with HFC-134a (R-134a) ........................ 163
Precaution for Service Equipment ........................ 164
Revision: September 2009 2010 Altima
HAC-4
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000005432601
DETAILED 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.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to HAC-5, "Description and Conditions" .
>> GO TO 3
3.GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis. Refer to HAC-82, "Symptom Matrix Chart" .
>> GO TO 4
4.REPAIR OR REPLACE
Repair or replace the specific parts.
>> GO TO 5
5.FINAL CHECK
Final check.
Is the inspection result normal?
YES >> Inspection End.
NO >> GO TO 3
Revision: September 2009 2010 Altima
INSPECTION AND ADJUSTMENT
HAC-5
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONER]
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INSPECTION AND ADJUSTMENT
Description and Conditions INFOID:0000000005432602
DESCRIPTION
The purpose of the operational check is to confirm that the system operates properly.
CONDITIONS:
• Engine running and at normal operation temperature.
Operational Check INFOID:0000000005432603
STEP 1: Check Blower
1. Turn blower control dial clockwise, blower should operate on low speed.
2. Continue turning blower control dial clockwise, and continue checking blower speeds until all speeds are
checked.
3. Leave blower on HI speed.
If NG, go to HAC-38, "Diagnosis Procedure" .
If OK, continue with next check.
STEP 2: Check Discharge Air
1. Press each mode switch and press DEF ( ) switch.
2. Each mode position indicator should illuminate.
3. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-14, "System
Description" .
NOTE:
Confirm that the compressor clutch is engaged (audio or visual inspection) and intake door is in the FRE
( ) position when the DEF ( ) is selected.
Intake door position is checked in the next step.
If NG, go to HAC-32, "Diagnosis Procedure" .
If OK, continue with next check.
STEP 3: Check Recirculation
1. Press REC ( ) switch.
Recirculation indicator should illuminate.
2. Press REC ( ) switch a second time.
3. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to HAC-34, "Diagnosis Procedure" .
If OK, continue with next check.
STEP 4: Check Temperature Decrease
1. Turn the temperature dial counterclockwise to 18°C (60F°).
2. Check for cold air at discharge air outlets.
If NG, go to HAC-83, "Component Function Check" .
If OK, continue with next check.
STEP 5: Check Temperature Increase
1. Turn the temperature dial clockwise to 32°C (90°F).
2. Check for hot air at discharge air outlets.
If NG, go to HAC-91, "Component Function Check" .
If OK, continue with next check.
STEP 6: Check AUTO Mode
1. Press the AUTO switch.
Revision: September 2009 2010 Altima
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Description
Easily tackle any vehicle issues with the 2010 Nissan Altima Service & Repair Manual. This comprehensive repair manual offers a Do-It-Yourself approach, providing all the necessary troubleshooting and replacement procedures recommended by the manufacturer.
Regular maintenance is essential for the longevity of your vehicle, and this manual has got you covered. With step-by-step instructions, clear images, and exploded-view illustrations, fixing problems has never been easier.
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Available in printable format and compatible with various electronic devices, including PC, Mac computers, Android and Apple smartphones and tablets, this manual offers convenience and versatility. And with the requirements being just Adobe Reader (free), there's no hassle in accessing vital information to maintain and repair your vehicle.
