Nissan Titan. Manual — part 382
AIR MIX DOOR MOTOR
HAC-33
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Rotate temperature control dial (passenger) to 32
°C (90°F).
4. Check voltage between front air control harness connector M49
terminal 2 and terminal 14 while rotating temperature control dial
(passenger) 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-8, "Removal and Installation"
4.
CHECK AIR MIX DOOR MOTOR (PASSENGER) 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 and M50 (A) terminal 28 and air mix door
motor (passenger) harness connector M143 (B) terminals 2, 3.
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
M50 (A) terminal 29 and air mix door motor (passenger) harness
connector M143 (B) terminal 4.
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
2
14
While rotating temperature control dial
(passenger) from 32
°C (90°F) to 18°C
(60
°F)
Battery voltage
14
2
While rotating temperature control dial
(passenger) from 18
°C (60°F) to 32°C
(90
°F)
Battery voltage
AWIIA0385ZZ
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M49 (C)
3
M143
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
M50
29
M143
4
Yes
AWIIA0133ZZ
HAC-34
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
2. Check continuity between front air control harness connector
M50 terminal 29 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 M49
(B) terminal 3, and M50 (A) terminal 28.
4. Check voltage between front air control harness connector M50
terminal 29 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 (passenger) harness connec-
tor M143.
2. Check voltage between front air control harness connector M50
terminal 29 and ground.
Is the inspection result normal?
YES
>> Inspect air mix door (passenger) for binding or mechani-
cal failure. If air mix door (passenger) moves freely,
replace front air control. Refer to
NO
>> Replace the air mix door motor (passenger). Refer to
VTL-20, "Removal and Installation"
Connector
Terminal
—
Continuity
M50
29
Ground
No
AWIIA0132ZZ
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M50
28
M49
3
5 Volts
AWIIA0813ZZ
Connector
Terminal
—
Voltage (Approx.)
M50
29
Ground
0 Volts
AWIIA0131ZZ
Connector
Terminal
—
Voltage (Approx.)
M50
29
Ground
0.2 to 4.8 Volts
AWIIA0131ZZ
INTAKE DOOR MOTOR
HAC-35
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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INTAKE DOOR MOTOR
System Description
INFOID:0000000009882456
SYSTEM DESCRIPTION
SYMPTOM:
• Intake door motor does not operate normally.
• Intake door does not change.
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
• Front air control
• Intake door motor (PRB built into the intake door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.
In the AUTO mode, the front air control determines the intake door position based on the ambient tempera-
ture, the intake air temperature and the in-vehicle temperature. When the DEF, D/F, FOOT or OFF switches
are pushed, the front air control sets the intake door at the fresh position.
Intake Door Control Specification
COMPONENT DESCRIPTION
WJIA1915E
WJIA0436E
HAC-36
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.
Intake Door Motor Component Function Check
INFOID:0000000009882457
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (
)
1. Press the mode switch to vent mode(
).
2. Press REC (
) switch. The REC (
)indicator should illuminate.
3. Press REC (
) switch again. The REC (
) indicator should go out.
4. Listen for intake door position change (you should hear blower sound change slightly).
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-36, "Intake Door Motor Diagnosis Procedure"
Intake Door Motor Diagnosis Procedure
INFOID:0000000009882458
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.
CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M49 (A) and
the intake door motor harness connector M58 (B).
3. Check continuity between front air control harness connector
M49 (A) terminals 21, 22 and the intake door motor harness
connector M58 (B) terminals 1, 6.
WJIA0552E
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
21
M58
6
Yes
22
1
AWIIA0401ZZ
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