Nissan Titan. Instruction — part 381
AIR MIX DOOR MOTOR
HAC-29
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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-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
AIR MIX DOOR MOTOR
HAC-31
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Reconnect front air control harness connectors.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M49
(B) terminal 3, and M50 (A) terminal 28.
4. Check voltage between front air control harness connector M49
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
M147.
2. Check voltage between front air control harness connector M49
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-8, "Removal and Installation"
.
NO
>> Replace air mix door motor (driver). Refer to
VTL-20, "Removal and Installation"
Air Mix Door Motor (Passenger) Component Function Check
INFOID:0000000009882454
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-32, "Air Mix Door Motor (Passenger) Diagnosis Proce-
.
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M50
28
M49
3
5 Volts
AWIIA0813ZZ
Connector
Terminal
—
Voltage (Approx.)
M49
6
Ground
0 Volts
AWIIA0382ZZ
Connector
Terminal
—
Voltage (Approx.)
M49
6
Ground
0.2 to 4.8 Volts
AWIIA0382ZZ
HAC-32
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
Air Mix Door Motor (Passenger) Diagnosis Procedure
INFOID:0000000009882455
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.
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.
2. Using CONSULT, check "PAS MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
3. Observe "PAS MIX FDBCK" voltage while rotating temperature control dial (passenger) between 32
°C
(90
°F) and 18°C (60°F).
Is the inspection result normal?
YES
>> • Air mix door motor (passenger) is OK.
• Inspect air mix door (passenger) for mechanical failure and repair if necessary. If air mix door
(passenger) is OK, refer to
HAC-83, "Component Function Check"
for insufficient cooling or
HAC-91, "Component Function Check"
for insufficient heating.
NO
>> GO TO 2.
2.
CHECK AIR MIX DOOR MOTOR (PASSENGER) 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 (passenger) harness connector M143 (B).
3. Check continuity between front air control harness connector
M49 (A) terminals 2, 14 and the air mix door motor (passenger)
harness connector M143 (B) terminals 1, 6.
4. Check continuity between front air control harness connector
M49 terminals 2, 14 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 (PASSENGER) POWER AND GROUND
Monitor Item
Condition
Results
PAS MIX FDBCK
Rotate temperature control dial (passenger) be-
tween 32
°C (90°F) and 18°C (60°F)
Voltage varies between 0.2 and 4.8 volts.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
14
M143
1
Yes
2
6
Connector
Terminal
—
Continuity
M49
14
Ground
No
2
AWIIA0389ZZ
AWIIA0386ZZ
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