2017 Infiniti QX70 (S51) Service & Repair Manual (+ Wiring Diagrams)

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 CONDITIONER BASIC INSPECTION ................................... 4 DIAGNOSIS AND REPAIR WORKFLOW ......... 4 Work Flow ................................................................ 4 INSPECTION AND ADJUSTMENT .................... 7 WITHOUT ACCS ........................................................ 7 WITHOUT ACCS : Description & Inspection ............ 7 WITHOUT ACCS : Temperature Setting Trimmer ...... 8 WITHOUT ACCS : Foot Position Setting Trimmer ...... 9 WITHOUT ACCS : Inlet Port Memory Function ..... 10 WITH ACCS .............................................................. 10 WITH ACCS : Description & Inspection ................. 10 WITH ACCS : Temperature Setting Trimmer ......... 13 WITH ACCS : Foot Position Setting Trimmer ........ 14 WITH ACCS : Inlet Port Memory Function ............. 15 WITH ACCS : Exhaust exhaust gas/outside odor detecting/Outside Odor Detecting Sensor Sensi- tivity Adjustment Function ...................................... 15 WITH ACCS : Auto Intake Interlocking Movement Change Function .................................................... 16 SYSTEM DESCRIPTION ............................ 17 COMPRESSOR CONTROL FUNCTION ...........17 WITHOUT ACCS ...................................................... 17 WITHOUT ACCS : Description .............................. 17 WITHOUT ACCS : Fail-safe ................................... 17 WITHOUT ACCS : Component Part Location ........ 18 WITHOUT ACCS : Component Description ........... 21 WITH ACCS .............................................................. 21 WITH ACCS : Description ...................................... 21 WITH ACCS : Fail-safe .......................................... 22 WITH ACCS : Component Part Location ............... 22 WITH ACCS : Component Description .................. 24 AUTOMATIC AIR CONDITIONER SYSTEM ....26 WITHOUT ACCS .......................................................26 WITHOUT ACCS : System Diagram ......................26 WITHOUT ACCS : System Description ..................26 WITHOUT ACCS : Component Part Location ........31 WITHOUT ACCS : Component Description ...........34 WITH ACCS ..............................................................34 WITH ACCS : System Diagram ..............................34 WITH ACCS : System Description .........................35 WITH ACCS : Component Part Location ................40 WITH ACCS : Component Description ...................42 PLASMACLUSTER SYSTEM ........................... 44 System Diagram .....................................................44 System Description .................................................44 Component Part Location .......................................45 Component Description ..........................................46 CAN COMMUNICATION SYSTEM ................... 47 System Description .................................................47 MODE DOOR CONTROL SYSTEM .................. 48 System Diagram .....................................................48 System Description .................................................48 AIR MIX DOOR CONTROL SYSTEM ............... 50 System Diagram .....................................................50 System Description .................................................50 INTAKE DOOR CONTROL SYSTEM ............... 52 WITHOUT ACCS .......................................................52 WITHOUT ACCS : System Diagram ......................52 WITHOUT ACCS : System Description ..................52 WITH ACCS ..............................................................53 WITH ACCS : System Diagram ..............................53 WITH ACCS : System Description .........................53 BLOWER MOTOR CONTROL SYSTEM .......... 55 System Diagram .....................................................55 System Description .................................................55 Revision: 2015 February 2015 QX70

HAC-2 MAGNET CLUTCH CONTROL SYSTEM ........ 57 System Diagram .................................................... 57 System Description ................................................ 57 DIAGNOSIS SYSTEM (UNIFIED METER & A/ C AMP.) ............................................................. 59 WITHOUT ACCS ...................................................... 59 WITHOUT ACCS : Diagnosis Description ............. 59 WITHOUT ACCS : CONSULT Function ................ 64 WITH ACCS ............................................................. 64 WITH ACCS : Diagnosis Description ..................... 64 WITH ACCS : CONSULT Function ........................ 69 DTC/CIRCUIT DIAGNOSIS ........................ 70 POWER SUPPLY AND GROUND CIRCUIT .... 70 UNIFIED METER AND A/C AMP. ............................ 70 UNIFIED METER AND A/C AMP. : Diagnosis Pro- cedure .................................................................... 70 UNIFIED METER AND A/C AMP. .................... 71 Description ............................................................. 71 Component Function Check .................................. 71 Diagnosis Procedure ............................................. 71 MODE DOOR MOTOR ..................................... 72 Description ............................................................. 72 Component Function Check ................................ 72 Diagnosis Procedure ............................................. 72 AIR MIX DOOR MOTOR (DRIVER SIDE) ........ 74 Description ............................................................. 74 Component Function Check ................................ 74 Diagnosis Procedure ............................................. 74 AIR MIX DOOR MOTOR (PASSENGER SIDE) ... 76 Description ............................................................. 76 Component Function Check ................................ 76 Diagnosis Procedure ............................................. 76 INTAKE DOOR MOTOR ................................... 78 WITHOUT ACCS ...................................................... 78 WITHOUT ACCS : Description .............................. 78 WITHOUT ACCS : Component Function Check ... 78 WITHOUT ACCS : Diagnosis Procedure ............... 78 WITH ACCS ............................................................. 79 WITH ACCS : Description ..................................... 79 WITH ACCS : Component Function Check ......... 79 WITH ACCS : Diagnosis Procedure ...................... 80 BLOWER MOTOR ............................................ 82 Description ............................................................. 82 Component Function Check ................................ 82 Diagnosis Procedure ............................................. 82 Component Inspection ........................................... 85 MAGNET CLUTCH ........................................... 86 Description ............................................................. 86 Component Function Check .................................. 86 Diagnosis Procedure .............................................. 86 ECV (ELECTRICAL CONTROL VALVE) ......... 88 Description ............................................................. 88 Diagnosis Procedure .............................................. 88 AMBIENT SENSOR .......................................... 90 Description ............................................................. 90 Component Function Check ................................. 90 Diagnosis Procedure .............................................. 90 Component Inspection ........................................... 91 IN-VEHICLE SENSOR ...................................... 93 Description ............................................................. 93 Component Function Check ................................. 93 Diagnosis Procedure .............................................. 93 Component Inspection ........................................... 94 SUNLOAD SENSOR ........................................ 96 Description ............................................................. 96 Component Function Check ................................. 96 Diagnosis Procedure .............................................. 96 Component Inspection ........................................... 97 INTAKE SENSOR ............................................. 99 Description ............................................................. 99 Component Function Check ................................. 99 Diagnosis Procedure .............................................. 99 Component Inspection ......................................... 100 EXHAUST GAS/OUTSIDE ODOR DETECT- ING SENSOR ................................................... 101 Description ........................................................... 101 Component Function Check ............................... 101 Diagnosis Procedure ............................................ 101 IONIZER ........................................................... 104 Description ........................................................... 104 Component Function Check ................................ 104 Diagnosis Procedure ............................................ 104 ECU DIAGNOSIS INFORMATION ............ 106 UNIFIED METER AND A/C AMP. ................... 106 Reference Value .................................................. 106 Wiring Diagram - AIR CONDITIONER CONTROL SYSTEM - ............................................................ 108 Fail-safe ............................................................... 117 ECM ................................................................. 119 VQ37VHR FOR USA AND CANADA ..................... 119 VQ37VHR FOR USA AND CANADA : Reference Value .................................................................... 119 VQ37VHR FOR MEXICO ....................................... 135 VQ37VHR FOR MEXICO : Reference Value ....... 135 VK50VE .................................................................. 150 VK50VE : Reference Value .................................. 150 Revision: 2015 February 2015 QX70

HAC-3 C D E F G H J K L M A B HAC N O P SYMPTOM DIAGNOSIS ........................... 169 AIR CONDITIONER CONTROL ...................... 169 Diagnosis Chart By Symptom .............................. 169 INSUFFICIENT COOLING .............................. 170 Description ........................................................... 170 Inspection procedure ............................................ 170 INSUFFICIENT HEATING ............................... 172 Description ........................................................... 172 Inspection procedure ............................................ 172 NOISE .............................................................. 174 Description ........................................................... 174 Inspection procedure ............................................ 174 SELF-DIAGNOSIS CANNOT BE PER- FORMED ......................................................... 176 Description ........................................................... 176 Inspection procedure ............................................ 176 MEMORY FUNCTION DOES NOT OPERATE .. 177 Description ........................................................... 177 Inspection procedure ............................................ 177 PRECAUTION ........................................... 178 PRECAUTIONS ............................................... 178 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" .............................................................. 178 Precautions Necessary for Steering Wheel Rota- tion After Battery Disconnection ........................... 178 Precaution for Procedure without Cowl Top Cover .. 179 Working with HFC-134a (R-134a) ........................ 179 General Refrigerant Precaution ........................... 179 Refrigerant Connection ........................................ 180 Service Equipment ............................................... 184 COMPRESSOR ............................................... 187 VQ37VHR ............................................................... 187 VQ37VHR : General Precautions ......................... 187 VK50VE .................................................................. 187 VK50VE : General Precautions ............................ 187 LEAK DETECTION DYE ................................. 188 General Precautions ............................................ 188 PREPARATION ........................................ 189 PREPARATION ............................................... 189 Special Service Tool ............................................ 189 Commercial Service Tool ..................................... 192 Sealant or/and Lubricant ...................................... 192 REMOVAL AND INSTALLATION ............ 193 PRESET SWITCH ........................................... 193 Exploded View ...................................................... 193 Removal and Installation ...................................... 193 UNIFIED METER AND A/C AMP. ................... 194 Exploded View ...................................................... 194 Removal and Installation ...................................... 194 AMBIENT SENSOR ........................................ 195 Exploded View ...................................................... 195 Removal and Installation ...................................... 195 IN-VEHICLE SENSOR .................................... 196 Exploded View ...................................................... 196 Removal and Installation ...................................... 196 SUNLOAD SENSOR ....................................... 197 Exploded View ...................................................... 197 Removal and Installation ...................................... 197 INTAKE SENSOR ........................................... 198 Exploded View ...................................................... 198 Removal and Installation ...................................... 199 EXHAUST GAS/OUTSIDE ODOR DETECT- ING SENSOR .................................................. 200 Exploded View ...................................................... 200 Removal and Installation ...................................... 200 REFRIGERANT PRESSURE SENSOR .......... 201 Exploded View ...................................................... 201 Removal and Installation ...................................... 201 DOOR MOTOR ................................................ 202 Exploded View ...................................................... 202 MODE DOOR MOTOR ............................................ 202 MODE DOOR MOTOR : Removal and Installation .. 202 AIR MIX DOOR MOTOR ......................................... 203 AIR MIX DOOR MOTOR : Removal and Installa- tion ........................................................................ 203 INTAKE DOOR MOTOR ......................................... 204 INTAKE DOOR MOTOR : Removal and Installa- tion ........................................................................ 204 IONIZER .......................................................... 205 Exploded View ...................................................... 205 Removal and Installation ...................................... 205 Revision: 2015 February 2015 QX70

HAC-4 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] DIAGNOSIS AND REPAIR WORKFLOW BASIC INSPECTION DIAGNOSIS AND REPAIR WORKFLOW Work Flow INFOID:0000000010581326 OVERALL SEQUENCE DETAILED FLOW JMIIA2097GB Revision: 2015 February 2015 QX70

DIAGNOSIS AND REPAIR WORKFLOW HAC-5 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] C D E F G H J K L M A B HAC N O P 1.GET INFORMATION FOR SYMPTOM 1. Get detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurs). 2. Check operation condition of the function that is malfunctioning. >> GO TO 2. 2.CHECK DTC 1. Check DTC. 2. Perform the following procedure if DTC is detected. - Record DTC and freeze frame data (Print them out using CONSULT.) - Erase DTC. - Study the relationship between the cause detected by DTC and the symptom described by the customer. 3. Check related service bulletins for information. Are any symptoms described and any DTC detected? Symptom is described, DTC is detected>>GO TO 3. Symptom is described, DTC is not detected>>GO TO 4. Symptom is not described, DTC is detected>>GO TO 7. 3.CONFIRM THE SYMPTOM Try to confirm the symptom described by the customer. Also study the normal operation and fail-safe related to the symptom. Verify relation between the symptom and the condition when the symptom is detected. >> GO TO 7. 4.CONFIRM THE SYMPTOM Try to confirm the symptom described by the customer. Also study the normal operation and fail-safe related to the symptom. Verify relation between the symptom and the condition when the symptom is detected. >> GO TO 5. 5.SELF-DIAGNOSIS WITH ON BOARD DIAGNOSIS SYSTEM Perform the self-diagnosis with on board diagnosis. Check that whether malfunction result is detected or not. Is malfunction result detected? YES >> GO TO 6. NO >> GO TO 8. 6.TROUBLE DIAGNOSIS BY MALFUNCTION Perform the trouble diagnosis for the detected malfunction result. Specify the malfunctioning part. >> GO TO 9. 7.PERFORM DTC CONFIRMATION PROCEDURE Perform DTC CONFIRMATION PROCEDURE for the detected DTC, and then check that DTC is detected again. At this time, always connect CONSULT to the vehicle, and check self diagnostic results in real time. If two or more DTCs are detected, refer to DTC INSPECTION PRIORITY CHART, and determine trouble diag- nosis order. NOTE: • Freeze frame data is useful if the DTC is not detected. • Perform Component Function Check if DTC CONFIRMATION PROCEDURE is not included on Service Manual. This simplified check procedure is an effective alternative though DTC cannot be detected during this check. If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIR- MATION PROCEDURE. Is DTC detected? Revision: 2015 February 2015 QX70

HAC-6 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] DIAGNOSIS AND REPAIR WORKFLOW YES >> GO TO 9. NO >> Check according to GI-47, " Intermittent Incident " . 8.DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step 4, and determine the trouble diagnosis order based on possible causes and symptom. Is the symptom described? YES >> GO TO 9. NO >> Monitor input data from related sensors or check voltage of related module terminals using CON- SULT. 9.DETECT MALFUNCTIONING PART BY DIAGNOSIS PROCEDURE Inspect according to Diagnosis Procedure of the system. Is malfunctioning part detected? YES >> GO TO 10. NO >> Check according to GI-47, " Intermittent Incident " . 10.REPAIR OR REPLACE THE MALFUNCTIONING PART 1. Repair or replace the malfunctioning part. 2. Reconnect parts or connectors disconnected during Diagnosis Procedure again after repair and replace- ment. 3. Check DTC. If DTC is detected, erase it. >> GO TO 11. 11.FINAL CHECK When DTC is detected in step 2, perform DTC CONFIRMATION PROCEDURE again, and then check that the malfunction is repaired securely. When symptom is described by the customer, refer to confirmed symptom in step 3 or 4, and check that the symptom is not detected. Is DTC detected and does symptom remain? YES-1 >> DTC is detected: GO TO 9. YES-2 >> Symptom remains: GO TO 4. NO >> Before returning the vehicle to the customer, always erase DTC. Revision: 2015 February 2015 QX70

INSPECTION AND ADJUSTMENT HAC-7 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] C D E F G H J K L M A B HAC N O P INSPECTION AND ADJUSTMENT WITHOUT ACCS WITHOUT ACCS : Description & Inspection INFOID:0000000010581327 DESCRIPTION The purpose of the operational check is to check that the individual system operates normally. INSPECTION PROCEDURE 1.CHECK MEMORY FUNCTION 1. Start the engine. 2. Turn temperature control dial (driver side) clockwise until 32.0°C (90°F) is displayed. 3. Press the OFF switch. 4. Turn the ignition switch OFF. 5. Turn the ignition switch ON. 6. Press the AUTO switch. 7. Check that the temperature setting before turning the ignition switch OFF is stored. Is the inspection result normal? YES >> GO TO 2. NO >> Memory function malfunction: HAC-177, " Inspection procedure " . 2.CHECK BLOWER MOTOR SPEED 1. Start the engine. 2. Press fan (UP: +) switch. Check that the fan speed changes. Check the operation for all fan speeds. 3. Set the fan speed to max speed. Is the inspection result normal? YES >> GO TO 3. NO >> Blower motor system malfunction: HAC-82, " Diagnosis Procedure " . 3.CHECK DISCHARGE AIR 1. Press the MODE switch and the DEF switch. 2. Each position indicator should change shape. 3. Confirm that discharge air comes out according to the air distribution table as follows: NOTE: Confirm that the compressor clutch is engaged (sound or visual inspection) and the intake door position is at FRE when D/F or DEF is selected. Is the inspection result normal? YES >> GO TO 4. NO >> Mode door system malfunction: HAC-72, " Diagnosis Procedure " . Conditions : Engine running at normal operating temperature JSIIA1208GB Revision: 2015 February 2015 QX70

HAC-8 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] INSPECTION AND ADJUSTMENT 4.CHECK INTAKE AIR 1. Press intake switch. REC indicator turns ON. 2. Press intake switch again. FRE indicator turns ON. 3. Listen for intake door position change. (Slight change of blower sound can be heard.) NOTE: Confirm that the compressor clutch is engaged (sound or visual inspection) and the intake door position is at FRE when D/F or DEF is selected. Is the inspection result normal? YES >> GO TO 5. NO >> Intake door system malfunction: HAC-78, " WITHOUT ACCS : Diagnosis Procedure " . 5.CHECK A/C SWITCH 1. Press the A/C switch. 2. A/C switch indicator turns ON. Confirm that the compressor clutch engages (sound or visual inspection). Is the inspection result normal? YES >> GO TO 6. NO >> Magnet clutch system malfunction: HAC-86, " Diagnosis Procedure " . 6.CHECK WITH TEMPERATURE SETTING LOWERED 1. Turn temperature control dial (driver side) counterclockwise until 18.0°C (60°F) is displayed. 2. Check that the cool air blows from the outlets. Is the inspection result normal? YES >> GO TO 7. NO >> Insufficient cooling: HAC-170, " Inspection procedure " . 7.CHECK WITH TEMPERATURE SETTING RAISED 1. Turn temperature control dial (driver side) clockwise until 32.0°C (90°F) is displayed. 2. Check that the warm air blows from the outlets. Is the inspection result normal? YES >> GO TO 8. NO >> Insufficient heating: HAC-172, " Inspection procedure " . 8.CHECK LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM FUNC- TION 1. Press the DUAL switch, and then check that “DUAL” is shown on the display. 2. Operate temperature control dial (driver side). Check that the discharge air temperature (driver side) changes. 3. Operate the temperature control dial (passenger side). Check that the discharge air temperature (passen- ger side) changes. 4. Press the DUAL switch, and then check that the temperature setting (LH/RH) is unified to the driver side temperature setting. Is the inspection result normal? YES >> GO TO 9. NO >> Refer to HAC-169, " Diagnosis Chart By Symptom " and perform the appropriate diagnosis. 9.CHECK AUTO MODE 1. Press the AUTO switch, and then check that “AUTO” is shown on the display. 2. Check that the discharge air and blower speed depend on ambient temperature, in-vehicle temperature and temperature setting. Is the inspection result normal? YES >> INSPECTION END NO >> Refer to HAC-169, " Diagnosis Chart By Symptom " and perform the appropriate diagnosis. WITHOUT ACCS : Temperature Setting Trimmer INFOID:0000000010581328 DESCRIPTION Revision: 2015 February 2015 QX70

INSPECTION AND ADJUSTMENT HAC-9 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] C D E F G H J K L M A B HAC N O P The trimmer compensates for differences in range of ±3°C (±6°F) between temperature setting (displayed dig- itally) and temperature felt by customer. Operating procedures for this trimmer are as per the following: 1. Begin self-diagnosis STEP-5 mode. Refer to HAC-59, " WITHOUT ACCS : Diagnosis Description " . 2. Press fan (UP: +) switch to set system in auxiliary mode. 3. Display shows “61” in auxiliary mechanism. It takes approximately 3 seconds to enable setting operation. 4. Turn temperature control dial (driver side) as desired. Temperature will change at a rate of 0.5°C (1.0°F) each time a dial is turned. CAUTION: A decimal point is not indicated on the display. NOTE: When battery cable is disconnected or battery voltage is below 10 V, trimmer operation is canceled. Tempera- ture set becomes that of initial condition. WITHOUT ACCS : Foot Position Setting Trimmer INFOID:0000000010581329 DESCRIPTION Wind distribution ratio in FOOT mode can be set. Operating procedures for this trimmer are as per the following: JSIIA1210GB Revision: 2015 February 2015 QX70

HAC-10 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] INSPECTION AND ADJUSTMENT 1. Begin self-diagnosis STEP-5 mode. Refer to HAC-59, " WITHOUT ACCS : Diagnosis Description " . 2. Press fan (UP: +) switch to set system in auxiliary mode. 3. Press mode switch as desired. NOTE: When battery cable is disconnected or battery voltage is below 10 V, trimmer operation is canceled. Air distri- bution ratio set becomes that of initial condition. WITHOUT ACCS : Inlet Port Memory Function INFOID:0000000010581330 DESCRIPTION When ignition switch is turned from OFF to ON, inlet port can be set to AUTO or manual. Operating procedures for this trimmer are as per the following: 1. Begin self-diagnosis STEP-5 mode. Refer to HAC-59, " WITHOUT ACCS : Diagnosis Description " . 2. Press fan (UP: +) switch to set system in auxiliary mode. 3. Press intake switch as desired. NOTE: When battery cable is disconnected or battery voltage is below 10 V, memory function is canceled. Memory function set becomes that of initial condition. WITH ACCS WITH ACCS : Description & Inspection INFOID:0000000010581331 DESCRIPTION The purpose of the operational check is to check that the individual system operates normally. INSPECTION PROCEDURE 1.CHECK MEMORY FUNCTION 1. Start the engine. JSIIA1209GB FRE indicator REC indicator Setting status Setting changeover method FRE REC OFF ON AUTO control (Initial setting) Manual REC status is memorized. (Initial setting) Intake switch: ON ON ON Manual FRE status is memorized. Manual REC status is memorized. ON OFF Manual FRE status is memorized. AUTO control OFF OFF AUTO control AUTO control Conditions : Engine running at normal operating temperature Revision: 2015 February 2015 QX70