Nissan Titan A60. Instruction — part 586
AIR MIX DOOR MOTOR
HAC-27
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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AIR MIX DOOR MOTOR
System Description
INFOID:0000000006164688
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:
• Front air control
• Air mix door motors (driver, passenger)
• PBR (built-into air mix door motors)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The front air control receives data from the temperature selected by the driver side, passenger side, and rear.
The front air control 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 front air con-
trol 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 front air control 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 front air control
AWIIA0372GB
HAC-28
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motors
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 front air
control. Motor rotation is then conveyed through a shaft and the air
mix door position is then fed back to the front air control by the PBR
built into the air mix door motors.
Air Mix Door Motor (Driver) Component Function Check
INFOID:0000000006164689
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.
Can a symptom be duplicated?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-28, "Air Mix Door Motor (Driver) Diagnosis Procedure"
Air Mix Door Motor (Driver) Diagnosis Procedure
INFOID:0000000006708575
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
1.
CHECK AIR MIX DOOR MOTOR (DRIVER) POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLT-
AGE
1. Turn ignition switch ON.
WJIA0435E
AWIIA0109ZZ
AIR MIX DOOR MOTOR
HAC-29
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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2. Using CONSULT-III, check "DVR MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
.
3. Observe "DVR MIX FDBACK" voltage while rotating temperature control dial (driver) between 32
°C (90°F)
and 18
°C (60°F).
Is the inspection result normal?
YES
>> • Air mix door motor (driver) is OK.
• Inspect air mix door (driver) for mechanical failure and repair if necessary. If air mix door (driver)
is OK, refer to
HAC-83, "Component Function Check"
for insufficient heating.
NO
>> GO TO 2.
2.
CHECK AIR MIX DOOR MOTOR (DRIVER) CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M49 (A) and
the air mix door motor (driver) harness connector M147 (B).
3. Check continuity between front air control harness connector
M49 (A) terminals 17, 18 and the air mix door motor (driver) har-
ness connector M147 (B) terminals 1, 6.
4. Check continuity between front air control harness connector
M49 terminals 17, 18 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR (DRIVER) POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Rotate temperature control dial (driver) to 32
°C (90°F).
4. Check voltage between front air control harness connector M49
terminal 17 and terminal 18 while rotating temperature control
dial (driver) to 18
°C (60°F) and back to 32°C (90°F).
Is the inspection result normal?
Monitor Item
Condition
Results
DVR MIX FDBCK
Rotate temperature control dial (driver) be-
tween 32
°C (90°F) and 18°C (60°F)
Voltage varies with dial rotation between 0.2 and 4.8
volts.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
17
M147
1
Yes
18
6
Connector
Terminal
—
Continuity
M49
17
Ground
No
18
AWIIA0377ZZ
AWIIA0374ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
17
18
While rotating temperature control
dial (driver) from 32
°C (90°F) to 18°C
(60
°F)
Battery voltage
18
17
While rotating temperature control
dial (driver) from 18
°C (60°F) to 32°C
(90
°F)
Battery voltage
AWIIA0373ZZ
HAC-30
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
4.
CHECK AIR MIX DOOR MOTOR (DRIVER) PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connectors.
3. Check continuity between front air control harness connector
M49 (C) terminal 3, connector M50 (A) terminal 28 and air mix
door motor (driver) harness connector M147 (B) terminals 3, 2.
4. Check continuity between front air control harness connector
M49 (C) terminal 3, M50 (A) terminal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
5.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
1. Check continuity between front air control harness connector
M49 (A) terminal 6 and air mix door motor (driver) harness con-
nector M147 (B) terminal 4.
2. Check continuity between front air control harness connector
M49 terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness as necessary.
6.
CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK
SIGNAL
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M49 (C)
3
M147
2
Yes
M50 (A)
28
3
Connector
Terminal
—
Continuity
M49 (C)
3
Ground
No
M50 (A)
28
AWIIA0393ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
6
M147
4
Yes
AWIIA0384ZZ
Connector
Terminal
—
Continuity
M49
6
Ground
No
AWIIA0383ZZ
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