Blower motor INFINITI M35 2007 Factory Service Manual

ATC-2Revision: 2007 April2007 M35/M45 AUTO SWITCH ................................................... 34
DEFROSTER (DEF) SWITCH ............................. 34
UPPER VENT SWITCH ...................................... 34
A/C SWITCH ....................................................... 35
FAN SWITCHES .................................................. 35
OFF SWITCH ...................................................... 35
REAR WINDOW DEFOGGER SWITCH ............. 35
INTAKE SWITCH ................................................. 35
DUAL SWITCH .................................................... 35
Control Operation (Rear Control Switch) ................ 35
AUTO SWITCH ................................................... 35
FAN SWITCH ...................................................... 35
REAR TEMPERATURE CONTROL SWITCH ..... 36
Fail-Safe Function .................................................. 36
Discharge Air Flow ................................................. 37
System Description ................................................. 38
SWITCHES AND THEIR CONTROL FUNCTION ... 38
CAN Communication System Description .............. 39
TROUBLE DIAGNOSIS ............................................ 40
CONSULT-II Function (ECM) .................................. 40
CONSULT-II BASIC OPERATION ....................... 40
DATA MONITOR .................................................. 40
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 40
WORK FLOW ...................................................... 40
SYMPTOM TABLE .............................................. 41
Component Parts and Harness Connector Location ... 42
ENGINE COMPARTMENT .................................. 42
PASSENGER COMPARTMENT .......................... 43
Schematic ............................................................... 44
Wiring Diagram —A/C— ......................................... 46
Auto Amp. Terminals and Reference Value ............ 54
PIN CONNECTOR TERMINAL LAYOUT ............ 54
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ........................ 54
Self-diagnosis Function .......................................... 56
DESCRIPTION .................................................... 56
FUNCTION CONFIRMATION PROCEDURE ...... 57
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 63
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 64
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION ................................................. 64
Operational Check .................................................. 65
CHECKING MEMORY FUNCTION ..................... 65
CHECKING BLOWER ......................................... 65
CHECKING DISCHARGE AIR (MODE SWITCH
AND DEF SWITCH) ............................................ 65
CHECKING DISCHARGE AIR (UPPER VENT
SWITCH) ............................................................. 66
CHECKING INTAKE AIR ..................................... 66
CHECKING TEMPERATURE DECREASE ......... 66
CHECKING TEMPERATURE INCREASE .......... 66
CHECKING A/C SWITCH ................................... 66
CHECKING AUTO MODE ................................... 66
Power Supply and Ground Circuit for Auto Amp. ... 67
INSPECTION FLOW ........................................... 67
COMPONENT DESCRIPTION ............................ 68DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 68
Rear Control Switch Circuit ..................................... 70
DIAGNOSIS PROCEDURE FOR REAR CON-
TROL SWITCH .................................................... 70
LAN System Circuit ................................................. 71
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 71
Mode Door Motor Circuit ......................................... 76
INSPECTION FLOW ............................................ 76
SYSTEM DESCRIPTION ..................................... 77
COMPONENT DESCRIPTION ............................ 78
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ................................................................ 78
Upper Ventilator Door Motor Circuit ........................ 79
INSPECTION FLOW ............................................ 79
SYSTEM DESCRIPTION ..................................... 80
COMPONENT DESCRIPTION ............................ 81
DIAGNOSIS PROCEDURE FOR UPPER VEN-
TILATOR DOOR MOTOR .................................... 81
Air Mix Door Motor Circuit ....................................... 82
INSPECTION FLOW ............................................ 82
SYSTEM DESCRIPTION ..................................... 83
COMPONENT DESCRIPTION ............................ 84
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR ................................................................ 84
Air Mix Door Motor PBR Circuit .............................. 84
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR ....................................................... 84
Intake Door Motor Circuit ........................................ 85
INSPECTION FLOW ............................................ 85
SYSTEM DESCRIPTION ..................................... 86
COMPONENT DESCRIPTION ............................ 87
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ................................................................ 87
Blower Motor Circuit ................................................ 88
INSPECTION FLOW ............................................ 88
SYSTEM DESCRIPTION ..................................... 89
COMPONENT DESCRIPTION ............................ 90
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ................................................................ 90
COMPONENT INSPECTION ............................... 92
Magnet Clutch Circuit .............................................. 93
INSPECTION FLOW ............................................ 93
SYSTEM DESCRIPTION ..................................... 94
DIAGNOSIS PROCEDURE FOR MAGNET
CLUTCH .............................................................. 94
COMPONENT INSPECTION ............................... 97
Insufficient Cooling .................................................. 98
INSPECTION FLOW ............................................ 98
PERFORMANCE TEST DIAGNOSIS ................100
PERFORMANCE CHART ..................................102
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE .................................................................104
DIAGNOSIS PROCEDURE FOR INSUFFI-
CIENT COOLING ...............................................106
Insufficient Heating ...............................................108
INSPECTION FLOW ..........................................108
Noise .....................................................................109
INSPECTION FLOW ..........................................109
Self-diagnosis .......................................................110

ATC-3
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Revision: 2007 April2007 M35/M45 INSPECTION FLOW .......................................... 110
Memory Function ................................................. . 111
INSPECTION FLOW ......................................... . 111
Ambient Sensor Circuit ......................................... 112
COMPONENT DESCRIPTION .......................... 112
AMBIENT TEMPERATURE INPUT PROCESS .. 112
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR ............................................................ 112
COMPONENT INSPECTION ............................. 114
In-vehicle Sensor Circuit ....................................... 115
COMPONENT DESCRIPTION .......................... 115
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR ............................................................ 116
COMPONENT INSPECTION ............................. 117
Sunload Sensor Circuit ......................................... 118
COMPONENT DESCRIPTION .......................... 118
SUNLOAD INPUT PROCESS ........................... 118
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR ............................................................ 118
COMPONENT INSPECTION ............................ 120
Intake Sensor Circuit ............................................ 121
COMPONENT DESCRIPTION ......................... 121
DIAGNOSIS PROCEDURE FOR INTAKE SEN-
SOR .................................................................. 121
COMPONENT INSPECTION ............................ 122
CONTROLLER ....................................................... 123
Removal and Installation of Multifunction Switch . 123
REMOVAL ......................................................... 123
INSTALLATION ................................................. 123
AUTO AMP ............................................................. 124
Removal and Installation of Unified Meter and A/C
Auto Amp. ............................................................ 124
REMOVAL ......................................................... 124
INSTALLATION ................................................. 124
AMBIENT SENSOR ................................................ 125
Removal and Installation ...................................... 125
REMOVAL ......................................................... 125
INSTALLATION ................................................. 125
IN-VEHICLE SENSOR ............................................ 126
Removal and Installation ...................................... 126
REMOVAL ......................................................... 126
INSTALLATION ................................................. 126
SUNLOAD SENSOR .............................................. 127
Removal and Installation ...................................... 127
REMOVAL ......................................................... 127
INSTALLATION ................................................. 127
INTAKE SENSOR ................................................... 128
Removal and Installation ...................................... 128
REMOVAL ......................................................... 128
INSTALLATION ................................................. 128
BLOWER UNIT ....................................................... 129
Removal and Installation ...................................... 129
REMOVAL ......................................................... 129
INSTALLATION ................................................. 129
Disassembly and Assembly ................................. 130
BLOWER MOTOR .................................................. 131
Removal and Installation ...................................... 131
REMOVAL ......................................................... 131
INSTALLATION ................................................. 131INTAKE DOOR MOTOR .........................................132
Removal and Installation ......................................132
REMOVAL .........................................................132
INSTALLATION .................................................132
IN-CABIN MICROFILTER .......................................133
Removal and Installation ......................................133
FUNCTION ........................................................133
REPLACEMENT TIMING ..................................133
REPLACEMENT PROCEDURES .....................133
HEATER & COOLING UNIT ASSEMBLY ...............134
Removal and Installation ......................................134
REMOVAL .........................................................134
INSTALLATION .................................................135
Disassembly and Assembly ..................................137
MODE DOOR MOTOR ............................................139
Removal and Installation ......................................139
REMOVAL .........................................................139
INSTALLATION .................................................139
AIR MIX DOOR MOTOR .........................................140
Removal and Installation ......................................140
REMOVAL .........................................................140
INSTALLATION .................................................140
UPPER VENTILATOR DOOR MOTOR ..................141
Removal and Installation ......................................141
REMOVAL .........................................................141
INSTALLATION .................................................141
HEATER CORE .......................................................142
Removal and Installation ......................................142
REMOVAL .........................................................142
INSTALLATION .................................................142
DUCTS AND GRILLES ...........................................143
Removal and Installation ......................................143
COMPONENT LAYOUT ....................................143
REMOVAL .........................................................145
INSTALLATION .................................................149
REFRIGERANT LINES ...........................................150
HFC-134a (R-134a) Service Procedure ...............150
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................150
Components .........................................................152
VQ35DE ............................................................152
VK45DE .............................................................153
Removal and Installation of Compressor ..............153
REMOVAL .........................................................153
INSTALLATION .................................................156
Check Disc to Pulley Clearance ...........................156
Removal and Installation of Low-pressure Flexible
Hose and Pipe ......................................................157
REMOVAL .........................................................157
INSTALLATION .................................................157
Removal and Installation of High-pressure Flexible
Hose .....................................................................158
REMOVAL .........................................................158
INSTALLATION .................................................159
Removal and Installation of High-pressure Pipe 1
(Engine Compartment) .........................................159
REMOVAL .........................................................159
INSTALLATION .................................................160
Removal and Installation of Low-pressure Pipe 1

AIR CONDITIONER CONTROL
ATC-31
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Revision: 2007 April2007 M35/M45
Stop signal:
At the end of each transmission, a stop operation, in-operation, or internal malfunction message is delivered to
the unified meter and A/C amp. This completes one data transmission and control cycle.
AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
FAN SPEED CONTROL
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
With pressing AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.
MODE DOOR CONTROL
The mode doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature and amount of sunload.
UPPER VENTILATOR DOOR CONTROL
The upper ventilator door is automatically controlled by the mode setting, and amount of sunload.
RJIA4019E

ATC-40
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSISPFP:00004
CONSULT-II Function (ECM)NJS000GD
CONSULT-II can display each diagnosis item using the diagnosis test modes shown following.
CONSULT-II BASIC OPERATION
Refer to GI-38, "CONSULT-II Start Procedure" .
DATA MONITOR
Operation Procedure
1. Touch “ENGINE” on “SELECT SYSTEM” screen.
2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
3. Touch “SELECTION FROM MENU” on “DATA MONITOR” screen.
4. When “SELECTION FROM MENU” is selected, touch items to be monitored.
5. Touch “START”.
6. Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop
recording, touch “STOP”.
Display Item List
How to Perform Trouble Diagnosis for Quick and Accurate RepairNJS000GE
WORK FLOW
System part Check item, diagnosis mode Description
ECM Data monitor Displays ECM input data in real time.
Monitor item name
“operation or unit”Contents
AIR COND SIG “ON/OFF” Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.
HEATER FAN SW “ON/OFF” Displays “FAN (ON)/FAN (OFF)” status as judged from blower fan motor switch signal.
IGNITION SW “ON/OFF” Displays “IGN position (ON)/OFF, ACC position (OFF)” status as judged from ignition switch signal.
AC PRESS SEN “V”Displays “Refrigerant pressure sensor for voltage” status as inputted from refrigerant pressure sen-
sor.
*1ATC-65, "Operational Check"
SHA900E

TROUBLE DIAGNOSIS
ATC-41
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SYMPTOM TABLE
Symptom Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C System.ATC-67, "
Power
Supply and Ground
Circuit for Auto
Amp."
A/C system cannot be controlled. Go to Multifunction Switch System.AV-108, "
Multifunc-
tion Switch Cannot
Be Operated" (With-
out mobile enter-
tainment system) or
AV-249, "
Multifunc-
tion Switch Cannot
Be Operated" ( Wi t h
mobile entertain-
ment system)
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN)ATC-76, "
Mode
Door Motor Circuit"Mode door motor does not operate normally.
Upper ventilator outlet does not change.
Go to Trouble Diagnosis Procedure for Upper Ventilator Door
Motor. (LAN)ATC-79, "
Upper
Ventilator Door
Motor Circuit"Upper ventilator door motor does not oper-
ate normally.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
(LAN)AT C - 8 2 , "
Air Mix
Door Motor Circuit"Air mix door motor does not operate nor-
mally.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor. (LAN)AT C - 8 5 , "
Intake
Door Motor Circuit"Intake door motor does not operate nor-
mally.
Blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Blower Motor.ATC-88, "
Blower
Motor Circuit"
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch.AT C - 9 3 , "Magnet
Clutch Circuit"
Insufficient coolingGo to Trouble Diagnosis Procedure for Insufficient Cooling.ATC-98, "
Insufficient
Cooling"
Go to Diagnosis Procedure for Insufficient Cooling.ATC-106, "
DIAG-
NOSIS PROCE-
DURE FOR
INSUFFICIENT
COOLING"
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating.ATC-108, "Insuffi-
cient Heating"
Noise Go to Trouble Diagnosis Procedure for Noise.ATC-109, "Noise"
Self-diagnosis cannot be performed. Go to Trouble Diagnosis Procedure for Self-diagnosis.ATC-110, "Self-diag-
nosis"
Memory function does not operate. Go to Trouble Diagnosis Procedure for Memory Function.AT C - 111 , "Memory
Function"
Rear control switch does not operate. Go to Trouble Diagnosis Procedure for Rear Control Switch.AT C - 7 0 , "Rear Con-
trol Switch Circuit"

ATC-54
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Auto Amp. Terminals and Reference ValueNJS000GI
Measure voltage between each terminal and ground by referring ter-
minals and reference value for unified meter and A/C amp.
PIN CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUE FOR UNIFIED METER AND A/C AMP.
RJIA4032E
RJIA4033E
Te r m i n a l
No.Wire
colorItemIgnition
switchConditionVoltag e
(V)
38 L/Y Blower motor control signal ONBlower speed: 1st speed
(manual)
41 V Power supply from ACC ACC — Battery voltage
43 R Intake sensor — — —
44 GR In-vehicle sensor — — —
45 W/V Ambient sensor — — —
46 BR/Y Sunload sensor — — —
53 W/G Power supply from IGN ON — Battery voltage
54 W/G Power supply from BATT OFF — Battery voltage
55 B Ground ON — Approx. 0
56 L CAN-H — — —
59 O/B Intake sensor ground ON — Approx. 0
60 P In-vehicle sensor ground ON — Approx. 0
61 LG/R Ambient sensor ground ON — Approx. 0
62 V/R Sunload sensor ground ON — Approx. 0
SJIA1454J

ATC-56
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Self-diagnosis FunctionNJS000GJ
DESCRIPTION
The self-diagnosis system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from normal control to the self-diagnosis system is accomplished by
starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. The OFF
switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system
will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step is
accomplished by means of pressing temperature control switch (driver side), as required.
Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing (fan) UP switch.
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ATC-58
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
6. STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED
1. Press temperature control (UP) switch (driver side).
2. Press (DEF) switch. Code No. of each door motor test is
indicated on the display.
>> GO TO 7.
7. CHECK ACTUATORS
Refer to the following chart and check discharge air flow, air temperature, blower motor duty ratio and com-
pressor operation.
SJIA1780E
RJIA4035E
Code No. 41 42 43 44 45 46
Mode door position VENT B/L 1 B/L 2
FOOT
*1D/F DEF
Upper ventilator door
positionOPEN SHUT SHUT SHUT SHUT SHUT
Intake door position REC REC 20% FRE FRE FRE FRE
Air mix door position FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Blower motor duty ratio 37% 91% 65% 65% 65% 91%
Compressor ON ON OFF OFF ON ON
Electronic control valve
(ECV) duty ratio100% 100% 0% 0% 50% 100%

TROUBLE DIAGNOSIS
ATC-59
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Revision: 2007 April2007 M35/M45
Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation.
*1: FOOT position during automatic control. Refer to AT C - 6 4 , "
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER" .
OK or NG
OK >> GO TO 8.
NG >>

Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to AT C - 7 6 , "
Mode Door Motor Circuit" .

Upper ventilator outlet does not change.
Go to Upper Ventilator Door Motor Circuit. Refer to AT C - 7 9 , "
Upper Ventilator Door Motor Cir-
cuit" .

Intake door does not change.
Go to Intake Door Motor Circuit. Refer to AT C - 8 5 , "
Intake Door Motor Circuit" .

Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to AT C - 8 2 , "
Air Mix Door Motor Circuit" .

Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to AT C - 8 8 , "
Blower Motor Circuit" .

Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to AT C - 9 3 , "
Magnet Clutch Circuit" .
8. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1. Press temperature control (UP) switch (driver side).
2. Code No. 51 appears on the display.
>> GO TO 9.
9. CHECK AMBIENT SENSOR
Press (DEF) switch one time. Temperature detected by ambient
sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK >> GO TO 10.
NG >> Go to Ambient Sensor Circuit. Refer to AT C - 11 2 , "
Ambi-
ent Sensor Circuit" .
10. CHECK IN-VEHICLE SENSOR
Press (DEF) switch for the second time. Temperature detected
by in-vehicle sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK >> GO TO 11.
NG >> Go to In-vehicle Sensor Circuit. Refer to AT C - 11 5 , "
In-
vehicle Sensor Circuit" .
PJIA0151E
PJIA0152E

TROUBLE DIAGNOSIS
ATC-65
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Revision: 2007 April2007 M35/M45
Operational CheckNJS000GK
The purpose of the operational check is to check if the individual system operates properly.
CHECKING MEMORY FUNCTION
1. Press the temperature control (UP) switch (driver side) until 32°C (90°F) is displayed.
2. Press OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Press OFF switch.
If NG, go to trouble diagnosis procedure for AT C - 111 , "
Memory Function" .
If OK, continue the check.
CHECKING BLOWER
1. Press fan (UP:+) switch. Blower should operate on low speed. The fan symbol should have one blade lit.
2. Press fan (UP:+) switch again, and continue checking blower speed and fan symbol until all speeds are
checked.
3. Leave blower on max. speed.
If NG, go to trouble diagnosis procedure for AT C - 8 8 , "
Blower Motor Circuit" .
If OK, continue the check.
CHECKING DISCHARGE AIR (MODE SWITCH AND DEF SWITCH)
1. Press MODE switch and DEF switch.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distribution table. Refer to AT C - 3 7 , "
Discharge
Air Flow" .
If NG, go to trouble diagnosis procedure for AT C - 7 6 , "
Mode Door Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at
FRESH when the D/F or DEF is selected.Conditions : Engine running at normal operating temperature
RJIA4035E