Infiniti QX56 (JA60). Manual — part 593
MODE DOOR MOTOR
HAC-29
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
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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 7 and ground while cycling mode switch through all
modes.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
11.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
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 7 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 mode door motor harness connector and A/C
auto amp. harness connector.
3. Check continuity between mode door motor harness connector
M142 (B) terminal 2 and A/C auto amp. harness connector M49
(A) terminal 7.
Is the inspection result normal?
YES
>> Replace mode door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
Voltage
: Approx. 1V - 4.5V
AWIIA0103ZZ
Continuity should not exist.
AWIIA0104ZZ
Continuity should exist.
AWIIA0105ZZ
HAC-30
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
AIR MIX DOOR MOTOR
System Description
INFOID:0000000005147690
SYSTEM DESCRIPTION
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Air mix door motors (driver, passenger, and rear)
• PBR (built-into air mix door motors)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The A/C auto amp. receives data from the temperature selected by the driver side, passenger side, and rear.
The A/C auto amp. then applies a voltage to one circuit of the appropriate air mix door motor, while ground is
applied to the other circuit, causing the appropriate air mix door motor to rotate. The direction of rotation is
determined by which circuit has voltage applied to it, and which one has ground applied to it. The A/C auto
amp. monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.
In AUTO mode the air mix, intake, mode door, and defrost door positions are set by the A/C auto amp. which
determines the proper position based on inputs from the in-vehicle sensor, ambient sensor, optical sensor,
intake sensor, and the temperature selected by the driver and front and rear passengers.
Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
door position data is returned to the A/C auto amp.
AWIIA0106GB
AIR MIX DOOR MOTOR
HAC-31
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motors (front)
The driver (1) and passenger (2) air mix door motors are attached to
the front heater & cooling unit assembly. These motors rotate so that
the air mix door is opened or closed to a position set by the A/C auto
amp. Motor rotation is then conveyed through a shaft and the air mix
door position is then fed back to the A/C auto amp. by the PBR built
into the air mix door motors.
Air Mix Door Motor (rear)
The air mix door motor (rear) (1) is attached to the rear heater &
cooling unit assembly. These motors rotate so that the air mix door is
opened or closed to a position set by the front (or rear) air control.
Motor rotation is then conveyed through a shaft and the air mix door
position is then fed back to the A/C auto amp. by the PBR built into
the air mix door motors.
Air Mix Door Motor (Driver) Component Function Check
INFOID:0000000005147691
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial (driver) clockwise until 32
°C (90°F) is displayed.
2. Check for hot air at discharge air outlets.
>> GO TO 2.
2.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn the temperature control dial (driver) counterclockwise until 18
°C (60°F) is displayed.
2. Check for cold air at discharge air outlets.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-32, "Air Mix Door Motor (Driver) Diagnosis Procedure"
AWIIA0107GB
AWIIA0109ZZ
AWIIA0111ZZ
HAC-32
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
Air Mix Door Motor (Driver) Diagnosis Procedure
INFOID:0000000005147692
Regarding Wiring Diagram information, refer to
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (DRIVER)
1.
CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Rotate temperature control dial (driver) to 32
°C (90°F).
3. Check voltage between A/C auto amp. harness connector M49
terminal 17 and terminal 18 while rotating temperature control
dial (driver) to 18
°C (60°F).
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK AIR MIX DOOR MOTOR (DRIVER) CIRCUITS FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M49 terminal 17, 18 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
3.
CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Rotate temperature control dial (driver) to 32
°C (90°F).
3. Check voltage between A/C auto amp. harness connector M49
terminal 17 and terminal 18 while rotating temperature control
dial (driver) to 18
°C (60°F).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
17 18
Rotate temp
control dial
Battery
voltage
AWIIA0112ZZ
17 - Ground
: Continuity should not exist.
18 - Ground
: Continuity should not exist.
AWIIA0114ZZ
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
18 17
Rotate temp
control dial
Battery
voltage
AWIIA0115ZZ
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