Nissan Frontier. Manual — part 868
HAC-26
< 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:0000000009478278
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-26, "Air Mix Door Motor (Driver) Diagnosis Procedure"
Air Mix Door Motor (Driver) Diagnosis Procedure
INFOID:0000000009478279
Regarding Wiring Diagram information, refer to
HAC-63, "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
ALIIA0756ZZ
AIR MIX DOOR MOTOR
HAC-27
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
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M
A
B
HAC
N
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2. Using CONSULT, 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-73, "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 M52 and the air mix door motor (driver) harness con-
nector M148.
3. Check continuity between front air control harness connector M52 terminals 17, 18 and the air mix door
motor (driver) harness connector M148 terminals 6, 5.
4. Check continuity between front air control harness connector
M52 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 M52
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?
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
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.
Connector
Terminal
Connector
Terminal
Continuity
M52
17
M148
6
Yes
18
5
Connector
Terminal
—
Continuity
M52
17
Ground
No
18
AWIIA0374ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M52
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-28
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
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 M52 terminal 3, connector M56 terminal 28
and air mix door motor (driver) harness connector M148 terminals 3, 1.
4. Check continuity between front air control harness connector M52 terminal 3, M56 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 M52 terminal 6 and air mix door motor
(driver) harness connector M148 terminal 2.
2. Check continuity between front air control harness connector
M52 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
1. Reconnect front air control harness connectors.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M52
(B) terminal 3, and M56 (A) terminal 28.
Connector
Terminal
Connector
Terminal
Continuity
M52
3
M148
3
Yes
M56
28
1
Connector
Terminal
—
Continuity
M52
3
Ground
No
M56
28
Connector
Terminal
Connector
Terminal
Continuity
M52
6
M148
2
Yes
Connector
Terminal
—
Continuity
M52
6
Ground
No
AWIIA0383ZZ
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M56
28
M52
3
5 Volts
AWIIA0813ZZ
AIR MIX DOOR MOTOR
HAC-29
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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B
HAC
N
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4. Check voltage between front air control harness connector M52
terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace front air control. Refer to
7.
CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL
1. Reconnect the air mix door motor (driver) harness connector
M148.
2. Check voltage between front air control harness connector M52
terminal 6 and ground.
Is the inspection result normal?
YES
>> Inspect air mix door (driver) for binding or mechanical
failure. If air mix door (driver) moves freely, replace front
air control. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Replace air mix door motor (driver). Refer to
VTL-23, "Removal and Installation"
Air Mix Door Motor (Passenger) Component Function Check
INFOID:0000000009478280
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial (passenger) 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 (passenger) 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-29, "Air Mix Door Motor (Passenger) Diagnosis Proce-
.
Air Mix Door Motor (Passenger) Diagnosis Procedure
INFOID:0000000009478281
Regarding Wiring Diagram information, refer to
HAC-63, "Wiring Diagram - Automatic Air Conditioner"
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)
1.
CHECK AIR MIX DOOR MOTOR (PASSENGER) POSITION BALANCED RESISTOR (PBR) FEEDBACK
VOLTAGE
1. Turn ignition switch ON.
Connector
Terminal
—
Voltage (Approx.)
M52
6
Ground
0 Volts
AWIIA0382ZZ
Connector
Terminal
—
Voltage (Approx.)
M52
6
Ground
0.2 to 4.8 Volts
AWIIA0382ZZ
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