Infiniti QX56 (JA60). Manual — part 597
DEFROSTER DOOR MOTOR CIRCUIT
HAC-45
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
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1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 terminal 28 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
8.
CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
1. Disconnect the defroster door motor harness connector.
2. Check continuity between defroster door motor harness connec-
tor M144 (B) terminal 3, 2 and A/C auto amp. harness connector
M50 (A) terminal 28, and M49 (C) terminal 3.
Is the inspection result normal?
YES
>> Replace defroster door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
10.
CHECK PBR FEEDBACK VOLTAGE
1. Reconnect the A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49
terminal 10 and ground while cycling defroster switch on and off.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
11.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
Continuity should not exist.
AWIIA0119ZZ
Continuity should exist.
AWIIA0120ZZ
28 - 3
: Continuity should exist.
3 - 2
: Continuity should exist.
AWIIA0121ZZ
Voltage
: Approx. 1V - 4.5V
AWIIA0157ZZ
HAC-46
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
DEFROSTER DOOR MOTOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M49 terminal 10 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
12.
CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the defroster door motor harness connector and A/C
auto amp. harness connector.
3. Check continuity between defroster door motor harness connec-
tor M144 (B) terminal 4 and A/C auto amp. harness connector
M49 (A) terminal 10
Is the inspection result normal?
YES
>> Replace defroster door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
Continuity should not exist.
AWIIA0158ZZ
Continuity should exist.
AWIIA0159ZZ
BLOWER MOTOR CONTROL SYSTEM
HAC-47
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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BLOWER MOTOR CONTROL SYSTEM
System Description
INFOID:0000000005147700
SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Variable blower control
• Front blower motor relay
• Front blower motor
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the A/C auto amp. and variable blower control
based on input from the in-vehicle sensor, optical sensor, intake sensor and ambient sensor, and potentio tem-
perature control (PTC).
When the air flow is increased, the blower motor speed is adjusted gradually to prevent a sudden increase in
air flow.
In addition to manual air flow control and the usual automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail-
able.
Starting Blower Speed Control
Start up from cold soak condition (Automatic mode).
In a cold start up condition where the engine coolant temperature is below 50
°C (122°F), the blower will not
operate at blower speed 1 for a short period of time (up to 210 seconds). The exact start delay time varies
depending on the ambient and engine coolant temperatures.
In the most extreme case (very low ambient temperature) the blower starting delay will be 210 seconds as
described above. After the coolant temperature reaches 50
°C (122°F), or the 210 seconds has elapsed, the
blower speed will increase to the objective blower speed.
Start up from usual operating or hot soak condition (Automatic mode).
The blower will begin operation momentarily after the AUTO switch is pushed. The blower speed will gradually
rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
AWIIA0173GB
HAC-48
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
Blower Speed Compensation - Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The speed will vary depending on the sunload. During conditions of low or no sunload, the blower
operates at low speed. During high sunload conditions, the A/C auto amp. causes the blower speed to
increase.
Blower Speed Control Specification
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control is located on the cooling unit. The vari-
able blower control receives a gate voltage from the A/C auto amp.
to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).
Front Blower Motor Component Function Check
INFOID:0000000005147701
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Push blower motor (+) switch. Blower motor should operate.
2. Push blower motor (+) switch and continue checking blower speed and fan symbol until all speeds are
checked.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-48, "Front Blower Motor Diagnosis Procedure"
Front Blower Motor Diagnosis Procedure
INFOID:0000000005147702
Regarding Wiring Diagram information, refer to
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
WJIA0441E
WJIA0559E
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