Infiniti QX56 (Z62). Manual — part 810
REAR BLOWER MOTOR
HAC-131
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
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HAC
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REAR BLOWER MOTOR
Diagnosis Procedure
INFOID:0000000006275978
1.
CHECK FUSE
1.
Turn ignition switch OFF.
2.
Check 20A fuse [No. 16, located in fuse block (J/B)].
NOTE:
Refer to
PG-140, "Fuse, Connector and Terminal Arrangement"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.
CHECK REAR BLOWER MOTOR POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect rear blower motor connector.
3.
Turn ignition switch ON.
4.
Check voltage between rear blower motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector between rear blower motor and fuse block (J/B).
3.
CHECK REAR BLOWER MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between rear blower motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK REAR BLOWER MOTOR CONTROL SIGNAL CIRCUIT
1.
Disconnect A/C auto amp. connector.
2.
Check continuity between rear blower motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
5.
CHECK REAR BLOWER MOTOR CONTROL SIGNAL
1.
Reconnect rear blower motor connector and A/C auto amp. connector.
2.
Turn ignition switch ON.
3.
Operate MODE switch to set air outlet to VENT.
+
−
Voltage
Rear blower motor
Connector
Terminal
M302
1
Ground
Battery voltage
Rear blower motor
—
Continuity
Connector
Terminal
M302
3
Ground
Existed
Rear blower motor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M302
2
M50
34
Existed
HAC-132
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
REAR BLOWER MOTOR
4.
Change fan speed from Lo to Hi, and check duty ratios between rear blower motor harness connector and
ground by using an oscilloscope.
NOTE:
Calculate drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms
Is the inspection result normal?
YES
>> Replace rear blower motor. Refer to
VTL-16, "REAR A/C UNIT ASSEMBLY : Removal and Instal-
.
NO
>> Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
Component Inspection
INFOID:0000000006275979
1.
CHECK REAR BLOWER MOTOR-I
1.
Remove rear blower motor.
2.
Check that there is not any mixing foreign object in the rear blower motor.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace rear blower motor. Refer to
VTL-16, "REAR A/C UNIT ASSEMBLY : Removal and Instal-
.
2.
CHECK REAR BLOWER MOTOR-II
Check that there is not breakage or damage in the rear blower motor.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace rear blower motor. Refer to
VTL-16, "REAR A/C UNIT ASSEMBLY : Removal and Instal-
.
3.
CHECK REAR BLOWER MOTOR-III
Check that rear blower motor turns smoothly.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace rear blower motor. Refer to
VTL-16, "REAR A/C UNIT ASSEMBLY : Removal and Instal-
.
Rear blower motor
Condition
Duty ratio
(Approx.)
Connector
Terminal
Fan speed (manual)
VENT mode
M272
2
1st
25 %
2nd
33 %
3rd
41 %
4th
51 %
5th
61 %
6th
69 %
7th
81 %
JPLIA1210GB
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
HAC-133
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
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SYMPTOM DIAGNOSIS
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
Diagnosis Chart By Symptom
INFOID:0000000006275980
NOTE:
Perform the self-diagnoses with CONSULT-III before performing the symptom diagnosis. If DTC is detected,
perform the corresponding diagnosis.
Symptom
Corresponding malfunction part
Reference
• Front air conditioning
system does not activate.
• Front air conditioning
system cannot be con-
trolled.
• Operation status of front
air conditioning system is
not indicated on front dis-
play.
Fail-safe activates
Multi AV system
Fail-safe does not acti-
vate
• Power supply system of A/C auto
amp.
• A/C auto amp.
HAC-110, "A/C AUTO AMP. : Diag-
nosis Procedure"
• Air outlet does not change (Except upper ventila-
tion).
• Front mode door motor does not operate normally.
• Circuit between front mode door
motor and A/C auto amp.
• Front mode door motor control link-
age
• Front mode door motor
• A/C auto amp.
HAC-112, "FRONT MODE DOOR
MOTOR : Diagnosis Procedure"
• Upper ventilator door does not change.
• Upper ventilator door motor does not operate nor-
mally.
• Circuit between upper ventilator
door motor and A/C auto amp.
• Upper ventilator door motor installa-
tion condition
• Upper ventilator door motor
• A/C auto amp.
HAC-116, "UPPER VENTILATOR
DOOR MOTOR : Diagnosis Proce-
dure"
• Discharge air temperature of driver side does not
change.
• Front air mix door motor (driver side) does not op-
erate normally.
• Circuit between front air mix door
motor (driver side) and A/C auto
amp.
• Front air mix door motor (driver side)
installation condition
• Front air mix door motor (driver side)
• A/C auto amp.
HAC-110, "FRONT AIR MIX DOOR
MOTOR (DRIVER SIDE) : Diagno-
sis Procedure"
• Discharge air temperature of passenger side does
not change.
• Front air mix door motor (passenger side) does not
operate normally.
• Circuit between front air mix door
motor (passenger side) and A/C
auto amp.
• Front air mix door motor (passenger
side) installation condition
• Front air mix door motor (passenger
side)
• A/C auto amp.
HAC-111, "FRONT AIR MIX DOOR
MOTOR (PASSENGER SIDE) : Di-
agnosis Procedure"
• Intake door does not change.
• Intake door motor does not operate normally.
• Circuit between intake door motor
and A/C auto amp.
• Intake door motor control linkage
• Intake door motor
• A/C auto amp.
HAC-113, "INTAKE DOOR MOTOR
: Diagnosis Procedure"
All door motors do not operate normally.
• Each door motor power supply and
ground circuit
• A/C auto amp.
HAC-118, "Diagnosis Procedure"
Front blower motor operation is malfunctioning.
• Power supply system of front blower
motor
• Circuit between front blower motor
and A/C auto amp..
• Front blower motor
• A/C auto amp.
HAC-134
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
Compressor does not operate.
• Circuit between magnet clutch and
IPDM E/R
• Magnet clutch
• IPDM E/R (A/C relay)
• Circuit between ECM and refriger-
ant pressure sensor
• Refrigerant pressure sensor
• CAN communication circuit
• A/C auto amp.
HAC-142, "Diagnosis Procedure"
• Insufficient cooling.
• No cool air comes out. (Air flow volume is normal.)
• Magnet clutch control system
• Drive belt slipping
• Refrigerant cycle
• Air leakage from each duct
• A/C auto amp. connection recogni-
tion signal circuit
• Temperature setting trimmer (front)
HAC-138, "FRONT AIR CONDI-
TIONER : Diagnosis Procedure"
• Insufficient heating.
• No warm air comes out. (Air flow volume is nor-
mal.)
• Engine cooling system
• Heater hose
• Heater core
• Air leakage from each duct
• Temperature setting trimmer (front)
HAC-140, "FRONT AIR CONDI-
TIONER : Diagnosis Procedure"
Noise is heard when front
air conditioning system op-
erates.
During compressor
operation
Refrigerant cycle
During front blower
motor operation
• Mixing any foreign object in front
blower motor
• Front blower motor fan breakage
• Front blower motor rotation inferiori-
ty
HAC-122, "Component Inspection
(Front Blower Motor)"
• Memory function does not operate.
• Setting temperature is not memorized.
• Battery power supply system of A/C
auto amp.
• A/C auto amp.
HAC-110, "A/C AUTO AMP. : Diag-
nosis Procedure"
Symptom
Corresponding malfunction part
Reference
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