2012 Nissan Juke Service & Repair Manual

HAC-1 VENTILATION, HEATER & AIR CONDITIONER C D E F G H J K L M SECTION HAC A B HAC N O P CONTENTS HEATER & AIR CONDITIONING CONTROL SYSTEM AUTOMATIC AIR CONDITIONING PRECAUTION .............................................. 5 PRECAUTIONS .................................................. 5 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" .................................................................. 5 SYSTEM DESCRIPTION ............................. 6 COMPONENT PARTS ....................................... 6 Component Parts Location ....................................... 6 Component Description ............................................ 7 A/C UNIT ASSEMBLY ................................................ 7 A/C UNIT ASSEMBLY : Aspirator ............................ 7 A/C UNIT ASSEMBLY : Intake Sensor .................... 7 A/C UNIT ASSEMBLY : Air Mix Door Motor ............ 7 A/C UNIT ASSEMBLY : Mode Door Motor .............. 8 A/C UNIT ASSEMBLY : Intake Door Motor .............. 8 A/C UNIT ASSEMBLY : Blower Motor ..................... 8 A/C UNIT ASSEMBLY : Power Transistor ............... 8 Multi Display Unit ..................................................... 9 A/C Auto Amp. ......................................................... 9 BCM ......................................................................... 9 ECM ......................................................................... 9 IPDM E/R ................................................................. 9 Ambient Sensor ........................................................ 9 In-vehicle Sensor ..................................................... 9 Sunload Sensor ........................................................ 9 Refrigerant Pressure Sensor .................................... 9 Magnet Clutch ........................................................ 10 SYSTEM ............................................................11 System Diagram ..................................................... 11 System Description ................................................ 11 Temperature Control .............................................. 12 Air Outlet Control .................................................... 13 Air Flow Control ...................................................... 13 Air Inlet Control ...................................................... 14 Compressor Control ............................................... 14 Door Control ...........................................................15 ECO Mode Control .................................................18 Fail-safe ..................................................................18 OPERATION ..................................................... 20 Switch Name and Function .....................................20 DIAGNOSIS SYSTEM (A/C AUTO AMP.) ........ 23 Description ..............................................................23 CONSULT Function ................................................23 DIAGNOSIS SYSTEM (BCM) ........................... 26 COMMON ITEM ........................................................26 COMMON ITEM : CONSULT Function (BCM - COMMON ITEM) ....................................................26 AIR CONDITIONER ..................................................27 AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER) (Automatic A/C) ....................27 ECU DIAGNOSIS INFORMATION ............. 29 A/C AUTO AMP. ............................................... 29 Reference Value .....................................................29 Fail-safe ..................................................................32 DTC Index ..............................................................32 MULTI DISPLAY UNIT, BCM, ECM, IPDM E/R ... 33 List of ECU Reference ............................................33 WIRING DIAGRAM ..................................... 34 AUTOMATIC AIR CONDITIONING SYSTEM ... 34 Wiring Diagram .......................................................34 BASIC INSPECTION .................................. 37 DIAGNOSIS AND REPAIR WORK FLOW ....... 37 Work Flow ...............................................................37 OPERATION INSPECTION .............................. 40 Revision: 2011 October 2012 JUKE

HAC-2 Work Procedure ..................................................... 40 SYSTEM SETTING ........................................... 42 Temperature Setting Trimmer ............................... 42 Inlet Port Memory Function (REC) ........................ 42 Inlet Port Memory Function (FRE) ......................... 43 Foot Position Setting Trimmer ............................... 43 DOOR MOTOR STARTING POSITION RE- SET ................................................................... 44 Description ............................................................. 44 Work Procedure ..................................................... 44 DTC/CIRCUIT DIAGNOSIS ........................ 45 U1000 CAN COMM CIRCUIT ........................... 45 Description ............................................................. 45 DTC Logic .............................................................. 45 Diagnosis Procedure ............................................. 45 U1010 CONTROL UNIT (CAN) ........................ 46 Description ............................................................. 46 DTC Logic .............................................................. 46 Diagnosis Procedure ............................................. 46 B2578, B2579 IN-VEHICLE SENSOR .............. 47 DTC Logic .............................................................. 47 Diagnosis Procedure ............................................. 47 Component Inspection ........................................... 48 B257B, B257C AMBIENT SENSOR ................ 50 DTC Logic .............................................................. 50 Diagnosis Procedure ............................................. 50 Component Inspection ........................................... 51 B2581, B2582 INTAKE SENSOR ..................... 53 DTC Logic .............................................................. 53 Diagnosis Procedure ............................................. 53 Component Inspection ........................................... 54 B2630, B2631 SUNLOAD SENSOR ................ 56 DTC Logic .............................................................. 56 Diagnosis Procedure ............................................. 56 Component Inspection ........................................... 57 B27A0, B27A1 INTAKE DOOR MOTOR ......... 59 DTC Logic .............................................................. 59 Diagnosis Procedure ............................................. 59 Component Inspection (PBR) ................................ 61 Component Inspection (Motor) .............................. 61 B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR ................................................. 63 DTC Logic .............................................................. 63 Diagnosis Procedure ............................................. 63 Component Inspection ........................................... 64 B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR ............................................................. 65 DTC Logic .............................................................. 65 Diagnosis Procedure ............................................. 65 Component Inspection ........................................... 66 POWER SUPPLY AND GROUND CIRCUIT .... 67 A/C AUTO AMP. ....................................................... 67 A/C AUTO AMP. : Diagnosis Procedure ................ 67 A/C ON SIGNAL ............................................... 69 Component Function Check .................................. 69 Diagnosis Procedure .............................................. 69 BLOWER FAN ON SIGNAL ............................. 71 Component Function Check .................................. 71 Diagnosis Procedure .............................................. 71 BLOWER MOTOR ............................................ 73 Diagnosis Procedure .............................................. 73 Component Inspection (Blower Motor) .................. 75 Component Inspection (Blower Relay) .................. 76 MAGNET CLUTCH ........................................... 77 Component Function Check .................................. 77 Diagnosis Procedure .............................................. 77 SYMPTOM DIAGNOSIS ............................ 78 AUTOMATIC AIR CONDITIONER SYSTEM ... 78 Symptom Table ...................................................... 78 INSUFFICIENT COOLING ................................ 80 Description ............................................................. 80 Diagnosis Procedure .............................................. 80 INSUFFICIENT HEATING ................................ 82 Description ............................................................. 82 Diagnosis Procedure .............................................. 82 COMPRESSOR DOES NOT OPERATE .......... 83 Description ............................................................. 83 Diagnosis Procedure .............................................. 83 REMOVAL AND INSTALLATION .............. 84 CONTROLLER ................................................. 84 Removal and Installation ........................................ 84 A/C AUTO AMP. ............................................... 85 Removal and Installation ........................................ 85 AMBIENT SENSOR .......................................... 86 Removal and Installation ........................................ 86 IN-VEHICLE SENSOR ...................................... 87 Removal and Installation ........................................ 87 SUNLOAD SENSOR ........................................ 88 Removal and Installation ........................................ 88 INTAKE SENSOR ............................................. 89 Exploded View ....................................................... 89 Removal and Installation ........................................ 89 REFRIGERANT PRESSURE SENSOR ........... 90 Revision: 2011 October 2012 JUKE

HAC-3 C D E F G H J K L M A B HAC N O P Exploded View ....................................................... 90 Removal and Installation ........................................ 90 POWER TRANSISTOR .....................................91 Exploded View ....................................................... 91 Removal and Installation ........................................ 91 DOOR MOTOR ..................................................92 Exploded View ....................................................... 92 INTAKE DOOR MOTOR ........................................... 93 INTAKE DOOR MOTOR : Removal and Installa- tion ......................................................................... 93 MODE DOOR MOTOR ............................................. 93 MODE DOOR MOTOR : Removal and Installation .... 93 AIR MIX DOOR MOTOR .......................................... 94 AIR MIX DOOR MOTOR : Removal and Installa- tion ......................................................................... 94 MANUAL AIR CONDITIONING PRECAUTION ............................................. 95 PRECAUTIONS .................................................95 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" ................................................................ 95 SYSTEM DESCRIPTION ............................ 96 COMPONENT PARTS ......................................96 Component Part Location ...................................... 96 Component Description .......................................... 96 A/C UNIT ASSEMBLY .............................................. 97 A/C UNIT ASSEMBLY : Thermo Control Amp. ...... 97 A/C UNIT ASSEMBLY : Blower Motor ................... 97 A/C UNIT ASSEMBLY : Blower Fan Resistor ........ 97 A/C Control ............................................................. 97 BCM ....................................................................... 98 ECM ....................................................................... 98 IPDM E/R ............................................................... 98 Refrigerant Pressure Sensor .................................. 98 Magnet Clutch ........................................................ 98 SYSTEM ............................................................99 System Diagram ..................................................... 99 System Description ................................................ 99 Compressor Control ............................................... 99 Door Control ......................................................... 100 OPERATION .................................................... 103 Switch Name and Function .................................. 103 DIAGNOSIS SYSTEM (BCM) ......................... 104 Description ........................................................... 104 COMMON ITEM ...................................................... 104 COMMON ITEM : CONSULT Function (BCM - COMMON ITEM) .................................................. 104 AIR CONDITIONER ................................................ 105 AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER) (Manual A/C) ...................... 105 ECU DIAGNOSIS INFORMATION ........... 106 BCM, ECM, IPDM E/R ..................................... 106 List of ECU Reference .......................................... 106 WIRING DIAGRAM ................................... 107 MANUAL AIR CONDITIONING SYSTEM ....... 107 Wiring Diagram ..................................................... 107 BASIC INSPECTION ................................ 108 DIAGNOSIS AND REPAIR WORK FLOW ..... 108 Work Flow ............................................................. 108 OPERATION INSPECTION ............................ 111 Work Procedure .................................................... 111 DTC/CIRCUIT DIAGNOSIS ...................... 113 A/C SWITCH ................................................... 113 Component Function Check ................................. 113 Diagnosis Procedure ............................................ 113 BLOWER FAN ON SIGNAL ........................... 115 Component Function Check ................................. 115 Diagnosis Procedure ............................................ 115 THERMO CONTROL AMPLIFIER .................. 117 Component Function Check ................................. 117 Diagnosis Procedure ............................................ 117 DEFROSTER POSITION SIGNAL .................. 119 Component Function Check ................................. 119 Diagnosis Procedure ............................................ 119 A/C INDICATOR .............................................. 121 Diagnosis Procedure ............................................ 121 BLOWER MOTOR .......................................... 123 Diagnosis Procedure ............................................ 123 Component Inspection (Blower Motor) ................. 125 Component Inspection (Blower Relay) ................. 125 Component Inspection (Blower Fan Resistor) ...... 125 Component Inspection (Fan Switch) .................... 125 MAGNET CLUTCH ......................................... 127 Component Function Check ................................. 127 Diagnosis Procedure ............................................ 127 SYMPTOM DIAGNOSIS ........................... 128 MANUAL AIR CONDITIONING SYSTEM ....... 128 Symptom Table .................................................... 128 INSUFFICIENT COOLING .............................. 130 Description ............................................................ 130 Diagnosis Procedure ............................................ 130 INSUFFICIENT HEATING ............................... 131 Revision: 2011 October 2012 JUKE

HAC-4 Description ............................................................ 131 Diagnosis Procedure ............................................ 131 COMPRESSOR DOES NOT OPERATE ........ 132 Description ............................................................ 132 Diagnosis Procedure ............................................ 132 REMOVAL AND INSTALLATION ............. 134 A/C CONTROL ............................................... 134 Exploded View ...................................................... 134 Removal and Installation ...................................... 134 THERMO CONTROL AMPLIFIER .................. 135 Removal and Installation ...................................... 135 REFRIGERANT PRESSURE SENSOR ......... 136 Exploded View ...................................................... 136 Removal and Installation ...................................... 136 BLOWER FAN RESISTOR ............................. 137 Exploded View ..................................................... 137 Removal and Installation ...................................... 137 DOOR CABLE ................................................. 138 Exploded View ..................................................... 138 INTAKE DOOR CABLE ......................................... 139 INTAKE DOOR CABLE : Removal and Installation . 139 MODE DOOR CABLE ............................................ 139 MODE DOOR CABLE : Removal and Installation . 140 AIR MIX DOOR CABLE ......................................... 140 AIR MIX DOOR CABLE : Removal and Installation . 140 Revision: 2011 October 2012 JUKE

PRECAUTIONS HAC-5 < PRECAUTION > [AUTOMATIC AIR CONDITIONING] C D E F G H J K L M A B HAC N O P PRECAUTION PRECAUTIONS Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" INFOID:0000000007577548 The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted. Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this Service Manual. WARNING: Always observe the following items for preventing accidental activation. • To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision that would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer. • Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see “SRS AIR BAG”. • Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser- vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS WARNING: Always observe the following items for preventing accidental activation. • When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing serious injury. • When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service. Revision: 2011 October 2012 JUKE

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2012 Nissan Juke Service & Repair Manual

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