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HAC


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VENTILATION, HEATER & AIR CONDITIONER




                                                                                                              HAC
                                                                                                                                                                     A


                                                                                                                                                                     B
                                                                                     SECTION
 HEATER & AIR CONDITIONING CONTROL SYSTEM                                                                                                                            C


                                                                                                                                                                     D


                                                                                                                                                                     E
                                                                    CONTENTS
                   MANUAL A/C (TYPE 1)                                               MANUAL A/C IDENTIFICATION TABLE ......... 18                                    F
                                                                                       Application Table ....................................................18
                                                                                                                                                         .
BASIC INSPECTION ................................... 4
                                                .
                                                                                     MODE DOOR MOTOR ...................................... 19                       G
MANUAL A/C IDENTIFICATION TABLE .......... 4
                                     .                                                 System Description .................................................19
                                                                                                                                                       .
  Application Table ...................................................... 4
                                                                    .                  Mode Door Motor Component Function Check ......19               .
                                                                                       Mode Door Motor Diagnosis Procedure .................20         .
DIAGNOSIS AND REPAIR WORKFLOW ......... 5
                                  .                                                                                                                                  H
  How to Perform Trouble Diagnosis For Quick And                                     AIR MIX DOOR MOTOR ................................... 24
  Accurate Repair ....................................................... 5
                                                                   .                   System Description .................................................24
                                                                                                                                                       .
                                                                                       Air Mix Door Motor Component Function Check ....25                            HAC
INSPECTION AND ADJUSTMENT .................... 6
                                         .                                             Air Mix Door Motor Diagnosis Procedure ...............26        .
  Operational Check ................................................... 6
                                                                 .
                                                                                     INTAKE DOOR MOTOR ................................... 30
FUNCTION DIAGNOSIS .............................. 7
                                             .                                         System Description .................................................30
                                                                                                                                                       .             J
                                                                                       Intake Door Motor Component Function Check .....30              .
MANUAL A/C IDENTIFICATION TABLE .......... 7
                                     .
                                                                                       Intake Door Motor Diagnosis Procedure ................31        .
  Application Table ...................................................... 7
                                                                    .
                                                                                                                                                                     K
                                                                                     BLOWER MOTOR ............................................ 33
FUNCTION INFORMATION ............................... 8
                                               .
                                                                                       System Description .................................................33
                                                                                                                                                       .
  Component Part Location ........................................ 8
                                                            .
                                                                                       Front Blower Motor Component Function Check ....33
                                                                                       Front Blower Motor Diagnosis Procedure ...............34        .             L
REFRIGERATION SYSTEM .............................10
                                              .
  Refrigerant Cycle ................................................... 10
                                                                   .                   Front Blower Motor Component Inspection ............38          .
  Refrigerant System Protection ............................... 10 .
                                                                                     MAGNET CLUTCH ........................................... 40                    M
MANUAL AIR CONDITIONER SYSTEM ..........11
                                    .                                                  System Description .................................................40
                                                                                                                                                       .
  Control System Diagram ........................................ 11
                                                                  .                    Magnet Clutch Component Function Check ...........40            .
  Control System Description .................................... 11
                                                                  .                    Magnet Clutch Diagnosis Procedure ......................40      .
                                                                                                                                                                     N
  Discharge Air Flow ................................................. 12
                                                                  .
                                                                                     INTAKE SENSOR ............................................. 45
  Switches And Their Control Function ..................... 13    .
                                                                                       System Description .................................................45
                                                                                                                                                       .
DIAGNOSIS SYSTEM (BCM) ...........................15
                                              .                                        Intake Sensor Diagnosis Procedure .......................45     .             O
  CONSULT-III Function (BCM - COMMON ITEM).... 15                                      Intake Sensor Component Inspection ....................46       .
  CONSULT-III Function (BCM - AIR CONDITION-
                                                                                     POWER SUPPLY AND GROUND CIRCUIT
  ER) ......................................................................... 15
                                                                           .                                                                                         P
                                                                                     FOR CONTROLLER ......................................... 47
SELF-DIAGNOSIS FUNCTION .........................17
                                             .                                         Component Description ..........................................47   .
  Front Air Control Self-Diagnosis ............................. 17
                                                            .                          Front Air Control Component Function Check ........47                .
  Front Air Control Self-Diagnosis Chart ................... 17
                                                            .                          Front Air Control Power and Ground Diagnosis
                                                                                       Procedure ...............................................................48
                                                                                                                                                            .
COMPONENT DIAGNOSIS ........................ 18
                                         .
                                                                                     ECU DIAGNOSIS ........................................ 49
                                                                                                                                        .

Revision: October 2008                                                        HAC-1                                                               2009 Xterra
MANUAL A/C IDENTIFICATION TABLE ......... 49
                                      .                                              Control System Description ................................... 82.
  Application Table ................................................... 49
                                                                    .                Discharge Air Flow ................................................. 83
                                                                                                                                                      .
                                                                                     Switches And Their Control Function ..................... 84     .
AIR CONDITIONER CONTROL ....................... 50
                                            .
  Front Air Control Terminals Reference Values ...... 50                  .        DIAGNOSIS SYSTEM (BCM) ........................... 86
                                                                                                                                  .
  Wiring Diagram - Air Conditioner Control - With                                    CONSULT-III Function (BCM - COMMON ITEM) ... 86
  VBC ....................................................................... 52
                                                                          .          CONSULT-III Function (BCM - AIR CONDITION-
                                                                                     ER) ......................................................................... 86
                                                                                                                                                               .
SYMPTOM DIAGNOSIS ............................ 58
                                           .
                                                                                   COMPONENT DIAGNOSIS ....................... 88
MANUAL A/C IDENTIFICATION TABLE ......... 58
                                      .
  Application Table ................................................... 58
                                                                    .              MANUAL A/C IDENTIFICATION TABLE ......... 88
                                                                                                                         .
                                                                                     Application Table ................................................... 88
                                                                                                                                                       .
AIR CONDITIONER CONTROL ....................... 59
                                            .
  Symptom Matrix Chart ......................................... 59
                                                             .                     MODE DOOR MOTOR ..................................... 89
                                                                                                                                     .
                                                                                     System Description ................................................ 89
                                                                                                                                                     .
INSUFFICIENT COOLING ................................ 60
                                                  .                                  Mode Door Motor Component Function Check ..... 89               .
  Component Function Check .................................. 60 .                   Mode Door Motor Diagnosis Procedure ................. 90        .
  Diagnostic Work Flow ............................................ 61
                                                                 .
  Performance Chart ................................................ 63
                                                                 .                 AIR MIX DOOR MOTOR .................................. 93
                                                                                                                                     .
  Trouble Diagnoses for Abnormal Pressure ........... 64         .                   System Description ................................................ 93
                                                                                                                                                     .
                                                                                     Air Mix Door Motor Component Function Check ... 94
INSUFFICIENT HEATING ................................ 68
                                                  .                                  Air Mix Door Motor Diagnosis Procedure ............... 95       .
  Component Function Check .................................. 68
                                                          .
                                                                                   INTAKE DOOR MOTOR ................................... 97
                                                                                                                                     .
NOISE ............................................................... 70
                                                                  .                  System Description ................................................ 97
                                                                                                                                                     .
  Component Function Check .................................. 70
                                                          .                          Intake Door Motor Component Function Check ..... 97             .
                                                                                     Intake Door Motor Diagnosis Procedure ................ 98       .
PRECAUTION ............................................ 72
                                                    .
                                                                                   BLOWER MOTOR ........................................... 100
                                                                                                                                         .
PRECAUTIONS ................................................ 72
                                                         .                           System Description .............................................. 100
                                                                                                                                                     .
  Supplemental Restraint System (SRS) "AIR BAG"                                      Front Blower Motor Component Function Check . 100
  and "SEAT BELT PRE-TENSIONER" ................... 72   .                           Front Blower Motor Diagnosis Procedure ............ 101         .
  Working with HFC-134a (R-134a) ......................... 72
                                                         .                           Front Blower Motor Component Inspection ......... 105           .
  Precaution for Service Equipment ......................... 73
                                                         .
                  MANUAL A/C (TYPE 2)                                              MAGNET CLUTCH .......................................... 107
                                                                                                                                         .
                                                                                     System Description .............................................. 107
                                                                                                                                                     .
BASIC INSPECTION .................................. 74
                                                .                                    Magnet Clutch Component Function Check ........ 107             .
                                                                                     Magnet Clutch Diagnosis Procedure ................... 107       .
MANUAL A/C IDENTIFICATION TABLE ......... 74
                                      .
  Application Table ................................................... 74
                                                                    .              INTAKE SENSOR ............................................ 112
                                                                                                                                           .
                                                                                     System Description .............................................. 112
                                                                                                                                                     .
DIAGNOSIS AND REPAIR WORKFLOW ........ 75
                                   .                                                 Intake Sensor Diagnosis Procedure .................... 112      .
  How to Perform Trouble Diagnosis For Quick And                                     Intake Sensor Component Inspection .................. 113       .
  Accurate Repair ..................................................... 75
                                                                    .
                                                                                   POWER SUPPLY AND GROUND CIRCUIT
INSPECTION AND ADJUSTMENT .................. 76
                                         .                                         FOR CONTROLLER ........................................ 114
                                                                                                                                        .
  Operational Check ................................................. 76
                                                                  .
                                                                                     Component Description ....................................... 114    .
FUNCTION DIAGNOSIS ............................ 78
                                            .                                        Front Air Control Component Function Check ..... 114                 .
                                                                                     Front Air Control Power and Ground Diagnosis
MANUAL A/C IDENTIFICATION TABLE ......... 78
                                      .                                              Procedure ............................................................ 115
                                                                                                                                                          .
  Application Table ................................................... 78
                                                                    .
                                                                                   ECU DIAGNOSIS ...................................... 116
FUNCTION INFORMATION ............................. 79
                                               .
  Component Part Location ...................................... 79
                                                             .                     MANUAL A/C IDENTIFICATION TABLE ........ 116
                                                                                                                         .
                                                                                     Application Table ................................................. 116
                                                                                                                                                       .
REFRIGERATION SYSTEM ............................. 81
                                               .
  Refrigerant Cycle ................................................... 81
                                                                    .              AIR CONDITIONER CONTROL ...................... 117
                                                                                                                               .
  Refrigerant System Protection ............................... 81  .                Front Air Control Terminals Reference Values .... 117                    .
                                                                                     Wiring Diagram - Air Conditioner Control - Without
MANUAL AIR CONDITIONER SYSTEM .......... 82
                                     .                                               VBC ...................................................................... 119
                                                                                                                                                              .
  Control System Diagram ....................................... 82
                                                             .
Revision: October 2008                                                      HAC-2                                                                   2009 Xterra
SYMPTOM DIAGNOSIS ........................... 126
                                            .                                INSUFFICIENT HEATING ............................... 136
                                                                               Component Function Check ................................. 136
                                                                                                                                       .                A
MANUAL A/C IDENTIFICATION TABLE ....... 126
                                     .
  Application Table .................................................. 126
                                                                    .        NOISE .............................................................. 138
                                                                               Component Function Check ................................. 138
                                                                                                                                       .
AIR CONDITIONER CONTROL ...................... 127
                                            .                                                                                                           B
  Symptom Matrix Chart ........................................ 127
                                                             .               PRECAUTION ........................................... 140
                                                                                                                                  .
INSUFFICIENT COOLING .............................. 128
                                                 .                           PRECAUTIONS ............................................... 140            C
  Component Function Check ................................. 128 .             Supplemental Restraint System (SRS) "AIR BAG"
  Diagnostic Work Flow .......................................... 129
                                                                 .             and "SEAT BELT PRE-TENSIONER" .................. 140   .
  Performance Chart ............................................... 131
                                                                 .             Working with HFC-134a (R-134a) ........................ 140
                                                                                                                                      .
                                                                                                                                                        D
  Trouble Diagnoses for Abnormal Pressure .......... 132         .             Precaution for Service Equipment ........................ 141
                                                                                                                                      .


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Revision: October 2008                                                HAC-3                                                           2009 Xterra
                               MANUAL A/C IDENTIFICATION TABLE
< BASIC INSPECTION >                                                     [MANUAL A/C (TYPE 1)]

BASIC INSPECTION
MANUAL A/C IDENTIFICATION TABLE
Application Table                                                                              INFOID:0000000004459414




               Manual A/C Type                 Description             Visual Identification




                                         Two Control Dial System
              Manual A/C (Type 1)      [with variable blower control
                                                  (VBC)]




                                                                                                     @ H@ 370YY
                                                                                                      V H/




                                        Three Control Dial System
              Manual A/C (Type 2)      [without variable blower con-
                                                 trol (VBC)]




                                                                                                     @ H@
                                                                                                      V H 0117YY




Revision: October 2008                          HAC-4                                              2009 Xterra
                            DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >                                                                [MANUAL A/C (TYPE 1)]
DIAGNOSIS AND REPAIR WORKFLOW
                                                                                                                           A
How to Perform Trouble Diagnosis For Quick And Accurate Repair                                   INFOID:0000000004459313




WORK FLOW                                                                                                                  B
1.LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. Get detailed information about the conditions and environment when the symp-                 C
tom occurs.

          >> GO TO 2                                                                                                       D
2.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
                                                                                                                           E

          >> GO TO 3.
3.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK                                                                                F
Verify the symptom with operational check. Refer to HAC-6, "Operational Check".
Can a symptom be duplicated?
 YES >> Go to trouble diagnosis. Refer to HAC-59, "Symptom Matrix Chart".                                                  G
 NO       >> GO TO 4.
4.PERFORM THE FRONT AIR CONTROL SELF-DIAGNOSIS                                                                             H
Perform front air control self-diagnosis. Refer to HAC-17, "Front Air Control Self-Diagnosis".

          >> If any diagnostic trouble codes set. Refer to HAC-17, "Front Air Control Self-Diagnosis Chart".               HAC
          >> Confirm the repair by performing operational check. Refer to HAC-6, "Operational Check".

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Revision: October 2008                             HAC-5                                             2009 Xterra
                                INSPECTION AND ADJUSTMENT
< BASIC INSPECTION >                                                               [MANUAL A/C (TYPE 1)]
INSPECTION AND ADJUSTMENT
Operational Check                                                                                INFOID:0000000004459314



The purpose of the operational check is to confirm that the system operates properly.

        Conditions         : Engine running and at normal operating temperature

CHECKING BLOWER
1. Turn blower control dial clockwise. Blower should operate on low speed.
2. Turn the blower control dial again, and continue checking each blower speed until all speeds are checked.
3. Leave blower on HI speed.
If NG, go to trouble diagnosis procedure for HAC-34, "Front Blower Motor Diagnosis Procedure".
If OK, continue with next check.
CHECKING DISCHARGE AIR
Press each mode switch and confirm that discharge air comes out according to the air distribution table. Refer
tot HAC-12, "Discharge Air Flow".
Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for HAC-20, "Mode Door Motor Diagnosis Procedure".
If OK, continue with next check.
NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
fresh when the DEF (      ) or D/F (  ) is selected.
CHECKING RECIRCULATION
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-31, "Intake Door Motor Diagnosis Procedure".
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected.
CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial counterclockwise.
2. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation if OK, go to trouble diagnosis procedure for HAC-60,
"Component Function Check". If air mix door motor appears to be malfunctioning, go to HAC-25, "Air Mix Door
Motor Component Function Check".
If OK, continue with next check.
CHECKING TEMPERATURE INCREASE
1. Rotate temperature control dial clockwise.
2. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for HAC-68,
"Component Function Check". If air mix door motor (front) appears to be malfunctioning, go to HAC-25, "Air
Mix Door Motor Component Function Check".
If OK, continue with next check.
CHECK A/C SWITCH
1.   Press A/C switch with the blower switch ON.
2.   A/C switch indicator will turn ON.
     



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