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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
         AUTOMATIC AIR CONDITIONER                                               Mode Door Motor Component Function Check ......23.                                F
                                                                                 Mode Door Motor Diagnosis Procedure .................24
                                                                                                                                  .
BASIC INSPECTION ................................... 5
                                                .
                                                                               AIR MIX DOOR MOTOR ................................... 28
                                                                                                                                                                   G
DIAGNOSIS AND REPAIR WORKFLOW ......... 5
                                  .                                              System Description .................................................28   .
  How to Perform Trouble Diagnosis For Quick And                                 Air Mix Door Motor Component Function Check ....29
  Accurate Repair ....................................................... 5
                                                                   .             Air Mix Door Motor (Driver) Diagnosis Procedure....30
                                                                                 Air Mix Door Motor (Passenger) Diagnosis Proce-                                   H
INSPECTION AND ADJUSTMENT .................... 6
                                         .                                       dure ........................................................................33
                                                                                                                                                          .
  Operational Check ................................................... 6
                                                                 .
                                                                               INTAKE DOOR MOTOR ................................... 37 HAC
FUNCTION DIAGNOSIS .............................. 8
                                             .                                   System Description .................................................37
                                                                                                                                                 .
                                                                                 Intake Door Motor Component Function Check .....38              .
FUNCTION INFORMATION ............................... 8
                                               .                                 Intake Door Motor Diagnosis Procedure ................39        .
  Component Part Location ........................................ 8
                                                                  .                                                                                                J
  Symptom Table ...................................................... 10
                                                                  .            DEFROSTER DOOR MOTOR CIRCUIT ........... 41
                                                                                 System Description .................................................41
                                                                                                                                                 .
REFRIGERATION SYSTEM .............................11
                                              .                                  Defroster Door Motor Component Function Check
  Refrigerant Cycle ................................................... 11
                                                                   .                                                                                               K
                                                                                                                                                 ....41
  Refrigerant System Protection ............................... 11 .             Defroster Door Motor Diagnosis Procedure ...........42          .
AUTOMATIC AIR CONDITIONER SYSTEM ....13                                        BLOWER MOTOR CONTROL SYSTEM .......... 46                                           L
  Control System Diagram ........................................ 13
                                                                  .              System Description .................................................46
                                                                                                                                                 .
  Control System Description .................................... 13
                                                                  .              Front Blower Motor Component Function Check ....47
  Discharge Air Flow ................................................. 15
                                                                  .              Front Blower Motor Diagnosis Procedure ...............48        .                 M
  Switches And Their Control Function ..................... 16    .              Front Blower Motor Component Inspection ............51          .
DIAGNOSIS SYSTEM (HVAC) .........................17
                                             .                                 MAGNET CLUTCH ........................................... 53
  CONSULT-III Function (HVAC) .............................. 17
                                                        .                                                                                                          N
                                                                                 System Description .................................................53
                                                                                                                                                 .
DIAGNOSIS SYSTEM (BCM) ...........................19
                                              .                                  Magnet Clutch Component Function Check ...........53            .
  CONSULT-III Function (BCM - COMMON ITEM).... 19                                Magnet Clutch Diagnosis Procedure ......................54      .
  CONSULT-III Function (BCM - AUTO AIR CON-                                                                                                                        O
                                                                               WATER VALVE CIRCUIT ................................. 58
  DITIONER) ............................................................. 19
                                                                     .
                                                                                 Description ..............................................................58
                                                                                                                                                       .
SELF-DIAGNOSIS FUNCTION .........................21
                                             .                                   Water Valve Diagnosis Procedure ..........................58          .
                                                                                                                                                                   P
  Front Air Control Self-Diagnosis ............................. 21
                                                            .                  AMBIENT SENSOR .......................................... 60
  Front Air Control Self-Diagnosis Code Chart ......... 21  .                    Component Description ..........................................60
                                                                                                                                             .
COMPONENT DIAGNOSIS ........................ 22
                                         .                                       Ambient Sensor Diagnosis Procedure ....................60   .
                                                                                 Ambient Sensor Component Inspection .................61     .
MODE DOOR MOTOR ......................................22
                                                  .
  System Description ................................................ 22
                                                                 .
                                                                               IN-VEHICLE SENSOR ...................................... 63


Revision: November 2008                                                 HAC-1                                                                    2009 Titan
  Component Description ......................................... 63
                                                              .                  How to Perform Trouble Diagnosis For Quick And
  In-Vehicle Sensor Diagnosis Procedure ................ 63   .                  Accurate Repair ..................................................... 99
                                                                                                                                                   .
  In-Vehicle Sensor Component Inspection ............. 65     .
                                                                                INSPECTION AND ADJUSTMENT ................. 100
                                                                                                                         .
OPTICAL SENSOR .......................................... 66
                                                      .                          Operational Check ............................................... 100
                                                                                                                                                 .
  Component Description ......................................... 66
                                                              .
  Optical Sensor Diagnosis Procedure ..................... 66 .                 FUNCTION DIAGNOSIS ........................... 102
INTAKE SENSOR ............................................. 68
                                                        .                       MANUAL A/C IDENTIFICATION TABLE ........ 102
                                                                                                                      .
  System Description ................................................ 68
                                                                  .              Application Table ................................................. 102
                                                                                                                                                   .
  Intake Sensor Diagnosis Procedure ...................... 68     .
  Intake Sensor Component Inspection ................... 69       .
                                                                                FUNCTION INFORMATION ............................ 103
                                                                                                                               .
                                                                                 Component Part Location .................................... 103 .
POWER SUPPLY AND GROUND CIRCUIT                                                  Symptom Table .................................................... 105
                                                                                                                                                  .
FOR CONTROLLER ......................................... 70
                                                     .
                                                                                REFRIGERATION SYSTEM ............................ 106
                                                                                                                               .
  Component Description ......................................... 70   .
                                                                                 Refrigerant Cycle ................................................. 106
                                                                                                                                                   .
  Front Air Control Component Function Check ....... 70                .
                                                                                 Refrigerant System Protection ............................. 106   .
  Front Air Control Power and Ground Diagnosis
  Procedure .............................................................. 71
                                                                       .        MANUAL AIR CONDITIONER SYSTEM ........ 108
                                                                                                                    .
                                                                                 Control System Diagram ...................................... 108.
ECU DIAGNOSIS ....................................... 72
                                                  .                              Control System Description ................................. 108 .
AIR CONDITIONER CONTROL ....................... 72
                                            .                                    Discharge Air Flow ............................................... 110
                                                                                                                                                  .
  Front Air Control Terminals Reference Values ...... 72            .            Switches And Their Control Function ................... 110      .
  Wiring Diagram ...................................................... 74
                                                                    .           DIAGNOSIS SYSTEM (HVAC) ........................ 112
                                                                                                                              .
SYMPTOM DIAGNOSIS ............................ 83
                                           .                                     CONSULT-III Function (HVAC) ........................... 112
                                                                                                                                       .

AIR CONDITIONER CONTROL ....................... 83
                                            .                                   DIAGNOSIS SYSTEM (BCM) .......................... 113
                                                                                                                               .
  Symptom Matrix Chart ......................................... 83
                                                             .                   CONSULT-III Function (BCM - COMMON ITEM) . 113
                                                                                 CONSULT-III Function (BCM - AUTO AIR CON-
INSUFFICIENT COOLING ................................ 84
                                                  .                              DITIONER) ........................................................... 113
                                                                                                                                                     .
  Component Function Check .................................. 84 .
  Diagnostic Work Flow ............................................ 85
                                                                 .
                                                                                SELF-DIAGNOSIS FUNCTION ....................... 115
                                                                                                                             .
  Performance Chart ................................................ 87
                                                                 .               Front Air Control Self-Diagnosis .......................... 115
                                                                                                                                           .
  Trouble Diagnoses for Abnormal Pressure ........... 88         .               Front Air Control Self-Diagnosis Code Chart ....... 115   .

INSUFFICIENT HEATING ................................ 92
                                                  .                             COMPONENT DIAGNOSIS ...................... 116
  Component Function Check .................................. 92
                                                          .                     MANUAL A/C IDENTIFICATION TABLE ........ 116
                                                                                                                      .
NOISE ............................................................... 94
                                                                  .              Application Table ................................................. 116
                                                                                                                                                   .
  Component Function Check .................................. 94
                                                          .                     MODE DOOR MOTOR .................................... 117
                                                                                                                                  .
MEMORY FUNCTION DOES NOT OPERATE... 95                                           System Description .............................................. 117
                                                                                                                                                 .
  Memory Function Check ........................................ 95
                                                             .                   Mode Door Motor Component Function Check ... 117                .
                                                                                 Mode Door Motor Diagnosis Procedure ............... 118         .
PRECAUTION ............................................ 96
                                                    .
                                                                                AIR MIX DOOR MOTOR ................................. 122
                                                                                                                                  .
PRECAUTIONS ................................................ 96
                                                         .                       System Description .............................................. 122
                                                                                                                                                 .
  Supplemental Restraint System (SRS) "AIR BAG"                                  Air Mix Door Motor Component Function Check . 122
  and "SEAT BELT PRE-TENSIONER" ................... 96   .                       Air Mix Door Motor Diagnosis Procedure ............. 123        .
  Working with HFC-134a (R-134a) ......................... 96
                                                         .
  Precaution for Service Equipment ......................... 97
                                                         .
                                                                                INTAKE DOOR MOTOR .................................. 127
                                                                                                                                  .
                                                                                 System Description .............................................. 127
                                                                                                                                                 .
                  MANUAL A/C (TYPE 1)                                            Intake Door Motor Component Function Check ... 127              .
BASIC INSPECTION .................................. 98
                                                .                                Intake Door Motor Diagnosis Procedure .............. 128        .

MANUAL A/C IDENTIFICATION TABLE ......... 98
                                      .                                         DEFROSTER DOOR MOTOR CIRCUIT ......... 130
                                                                                                                    .
  Application Table ................................................... 98
                                                                    .            System Description .............................................. 130
                                                                                                                                                 .
                                                                                 Defroster Door Motor Component Function Check
DIAGNOSIS AND REPAIR WORKFLOW ........ 99
                                   .                                                                                                             . 130
                                                                                 Defroster Door Motor Diagnosis Procedure ......... 131          .

Revision: November 2008                                                  HAC-2                                                              2009 Titan
BLOWER MOTOR CONTROL SYSTEM ........ 135
                                  .                                             PRECAUTIONS ............................................... 180
  System Description .............................................. 135
                                                                 .                Supplemental Restraint System (SRS) "AIR BAG"                               A
  Front Blower Motor Component Function Check .. 135                              and "SEAT BELT PRE-TENSIONER" .................. 180   .
  Front Blower Motor Diagnosis Procedure ............ 136        .                Working with HFC-134a (R-134a) ........................ 180
                                                                                                                                         .
  Front Blower Motor Component Inspection .......... 139         .                Precaution for Service Equipment ........................ 181
                                                                                                                                         .                    B
                                                                                                 MANUAL A/C (TYPE 2)
MAGNET CLUTCH .......................................... 141
                                                      .
  System Description .............................................. 141
                                                                 .              BASIC INSPECTION ................................ 182
                                                                                                                                .
  Magnet Clutch Component Function Check ........ 141            .                                                                                            C
  Magnet Clutch Diagnosis Procedure .................... 142     .              MANUAL A/C IDENTIFICATION TABLE ....... 182
                                                                                  Application Table .................................................. 182
                                                                                                                                                    .
WATER VALVE CIRCUIT ............................... 146
                                                 .                                                                                                            D
  Description ........................................................... 146
                                                                       .        DIAGNOSIS AND REPAIR WORKFLOW ...... 183
  Water Valve Diagnosis Procedure ....................... 146          .          How to Perform Trouble Diagnosis For Quick And
                                                                                  Accurate Repair .................................................... 183
                                                                                                                                                    .
AMBIENT SENSOR ........................................ 148
                                                     .                                                                                                        E
  Component Description ........................................ 148
                                                              .                 INSPECTION AND ADJUSTMENT ................ 184
  Ambient Sensor Diagnosis Procedure ................. 148    .                   Operational Check ................................................ 184
                                                                                                                                                  .
  Ambient Sensor Component Inspection ............... 149     .                                                                                               F
                                                                                FUNCTION DIAGNOSIS ........................... 186
                                                                                                                             .
INTAKE SENSOR ........................................... 151
                                                       .
  System Description .............................................. 151
                                                                 .              MANUAL A/C IDENTIFICATION TABLE ....... 186
  Intake Sensor Diagnosis Procedure ..................... 151    .                Application Table .................................................. 186
                                                                                                                                                    .         G
  Intake Sensor Component Inspection .................. 152      .
                                                                                FUNCTION INFORMATION ............................ 187
POWER SUPPLY AND GROUND CIRCUIT                                                   Component Part Location ..................................... 187
                                                                                                                                                  .
                                                                                                                                                              H
FOR CONTROLLER ....................................... 153
                                                    .                             Symptom Table .................................................... 189
                                                                                                                                                  .
  Component Description ........................................ 153   .
                                                                                REFRIGERATION SYSTEM ........................... 190
  Front Air Control Component Function Check ..... 153                 .
                                                                                  Refrigerant Cycle .................................................. 190
                                                                                                                                                    .         HAC
  Front Air Control Power and Ground Diagnosis
                                                                                  Refrigerant System Protection .............................. 190  .
  Procedure ............................................................. 154
                                                                       .
                                                                                MANUAL AIR CONDITIONER SYSTEM ........ 192
ECU DIAGNOSIS ...................................... 155
                                                   .                              Control System Diagram ...................................... 192
                                                                                                                                                  .           J
MANUAL A/C IDENTIFICATION TABLE ....... 155
                                     .                                            Control System Description .................................. 192
                                                                                                                                                  .
  Application Table .................................................. 155
                                                                    .             Discharge Air Flow ............................................... 193
                                                                                                                                                  .
                                                                                  Switches And Their Control Function ................... 194     .           K
AIR CONDITIONER CONTROL ...................... 156
                                            .
  Front Air Control Terminals Reference Values .... 156            .            DIAGNOSIS SYSTEM (BCM) ......................... 196
  Wiring Diagram .................................................... 158
                                                                   .              CONSULT-III Function (BCM - COMMON ITEM).. 196
                                                                                                                                                              L
                                                                                  CONSULT-III Function (BCM - AUTO AIR CON-
SYMPTOM DIAGNOSIS ........................... 166
                                            .                                     DITIONER) ........................................................... 196
                                                                                                                                                     .

MANUAL A/C IDENTIFICATION TABLE ....... 166
                                     .                                          COMPONENT DIAGNOSIS ...................... 198
                                                                                                                         .                                    M
  Application Table .................................................. 166
                                                                    .
                                                                                MANUAL A/C IDENTIFICATION TABLE ....... 198
AIR CONDITIONER CONTROL ...................... 167
                                            .                                     Application Table .................................................. 198
                                                                                                                                                    .
                                                                                                                                                              N
  Symptom Matrix Chart ........................................ 167
                                                             .
                                                                                MODE DOOR MOTOR .................................... 199
INSUFFICIENT COOLING .............................. 168
                                                 .                                System Description ............................................... 199
                                                                                                                                                  .
  Component Function Check ................................. 168 .                Mode Door Motor Component Function Check .... 199               .           O
  Diagnostic Work Flow .......................................... 169
                                                                 .                Mode Door Motor Diagnosis Procedure ............... 200         .
  Performance Chart ............................................... 171
                                                                 .
  Trouble Diagnoses for Abnormal Pressure .......... 172         .              AIR MIX DOOR MOTOR ................................. 204
                                                                                  System Description ............................................... 204
                                                                                                                                                  .           P
INSUFFICIENT HEATING ............................... 176
                                                  .                               Air Mix Door Motor Component Function Check .. 204
  Component Function Check ................................. 176
                                                          .                       Air Mix Door Motor Diagnosis Procedure ............. 205        .

NOISE .............................................................. 178
                                                                  .             INTAKE DOOR MOTOR ................................. 209
  Component Function Check ................................. 178
                                                          .                       System Description ............................................... 209
                                                                                                                                                  .
                                                                                  Intake Door Motor Component Function Check ... 209              .
PRECAUTION ........................................... 180
                                                     .                            Intake Door Motor Diagnosis Procedure .............. 210        .

Revision: November 2008                                                  HAC-3                                                               2009 Titan
DEFROSTER DOOR MOTOR CIRCUIT ........ 212
                                    .                                           MANUAL A/C IDENTIFICATION TABLE ........ 234
                                                                                                                      .
  System Description ...............................................212
                                                                  .               Application Table ................................................. 234
                                                                                                                                                    .
  Defroster Door Motor Component Function Check
                                                                  ..212         AIR CONDITIONER CONTROL ...................... 235
                                                                                                                            .
  Defroster Door Motor Diagnosis Procedure ..........213          .               Front Air Control Terminals Reference Values .... 235             .
                                                                                  Wiring Diagram .................................................... 237
                                                                                                                                                    .
BLOWER MOTOR CONTROL SYSTEM ....... 217
                                  .
  System Description ...............................................217
                                                                  .             SYMPTOM DIAGNOSIS ........................... 245
  Front Blower Motor Component Function Check ..217
  Front Blower Motor Diagnosis Procedure .............218         .
                                                                                MANUAL A/C IDENTIFICATION TABLE ........ 245
                                                                                                                      .
                                                                                  Application Table ................................................. 245
                                                                                                                                                    .
  Front Blower Motor Component Inspection ..........221           .

MAGNET CLUTCH ......................................... 223
                                                      .                         AIR CONDITIONER CONTROL ...................... 246
                                                                                                                            .
                                                                                  Symptom Matrix Chart ........................................ 246
                                                                                                                                              .
  System Description ...............................................223
                                                                  .
  Magnet Clutch Component Function Check .........223             .             INSUFFICIENT COOLING ............................... 247
                                                                                                                                  .
  Magnet Clutch Diagnosis Procedure ....................223       .               Component Function Check ................................ 247   .
WATER VALVE CIRCUIT ............................... 228
                                                  .                               Diagnostic Work Flow .......................................... 248
                                                                                                                                                  .
                                                                                  Performance Chart ............................................... 250
                                                                                                                                                  .
  Description ............................................................228
                                                                        .
                                                                                  Trouble Diagnoses for Abnormal Pressure .......... 251          .
  Water Valve Diagnosis Procedure ........................228           .

INTAKE SENSOR ........................................... 230
                                                        .                       INSUFFICIENT HEATING ............................... 255
                                                                                                                                  .
                                                                                  Component Function Check ................................ 255
                                                                                                                                          .
  System Description ...............................................230
                                                                  .
  Intake Sensor Diagnosis Procedure .....................230      .             NOISE .............................................................. 257
                                                                                                                                                  .
  Intake Sensor Component Inspection ..................231        .               Component Function Check ................................ 257
                                                                                                                                          .
POWER SUPPLY AND GROUND CIRCUIT                                                 PRECAUTION ........................................... 258
FOR CONTROLLER ....................................... 232
                                                     .
  Component Description ........................................232    .        PRECAUTIONS ............................................... 258
                                                                                                                                         .
  Front Air Control Component Function Check ......232                 .          Supplemental Restraint System (SRS) "AIR BAG"
  Front Air Control Power and Ground Diagnosis                                    and "SEAT BELT PRE-TENSIONER" ................. 258    .
  Procedure .............................................................233
                                                                       .          Working with HFC-134a (R-134a) ........................ 258
                                                                                                                                         .
                                                                                  Precaution for Service Equipment ....................... 259
                                                                                                                                         .
ECU DIAGNOSIS ...................................... 234
                                                  .




Revision: November 2008                                                  HAC-4                                                              2009 Titan
                            DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >                                                     [AUTOMATIC AIR CONDITIONER]

BASIC INSPECTION                                                                                                           A
DIAGNOSIS AND REPAIR WORKFLOW
How to Perform Trouble Diagnosis For Quick And Accurate Repair                                   INFOID:0000000003790016
                                                                                                                           B

WORK FLOW
1.LISTEN TO CUSTOMER COMPLAINT                                                                                             C
Listen to customer complaint. Get detailed information about the conditions and environment when the symp-
tom occurs.
                                                                                                                           D
         >> GO TO 2
2.CHECK FOR SERVICE BULLETINS                                                                                              E
Check for any service bulletins.

         >> GO TO 3.                                                                                                       F
3.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to HAC-6, "Operational Check".                                            G
Can a symptom be duplicated?
 YES >> GO TO 4
 NO       >> GO TO 5                                                                                                       H
4.GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis. Refer to HAC-83, "Symptom Matrix Chart".
                                                                                                                           HAC
Can a symptom be duplicated?
        >> GO TO 5.
5.PERFORM THE FRONT AIR CONTROL SELF-DIAGNOSIS                                                                             J
Perform front air control self-diagnosis. Refer to HAC-21, "Front Air Control Self-Diagnosis".

                                                                                                                           K
         >> If any diagnostic trouble codes set. Refer to HAC-21, "Front Air Control Self-Diagnosis Code
            Chart".
         >> Confirm the repair by performing operational check. Refer to HAC-6, "Operational Check".
                                                                                                                           L



                                                                                                                           M



                                                                                                                           N



                                                                                                                           O



                                                                                                                           P




Revision: November 2008                            HAC-5                                              2009 Titan
                                INSPECTION AND ADJUSTMENT
< BASIC INSPECTION >                                                     [AUTOMATIC AIR CONDITIONER]
INSPECTION AND ADJUSTMENT
Operational Check                                                                                INFOID:0000000003790017



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

        Conditions          : Engine running and at normal operating temperature

CHECKING MEMORY FUNCTION
1.   Set the temperature to 32



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