Nissan Titan. Manual — part 425
INTAKE DOOR MOTOR
HAC-205
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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HAC
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INTAKE DOOR MOTOR
System Description
INFOID:0000000009882581
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 (PBR built into the intake door motor)
• 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.
Intake Door Control Specification
COMPONENT DESCRIPTION
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:0000000009882582
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (
)
1. Press the vent mode switch (
).
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).
WJIA0436E
WJIA0552E
HAC-206
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
INTAKE DOOR MOTOR
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-206, "Intake Door Motor Diagnosis Procedure"
Intake Door Motor Diagnosis Procedure
INFOID:0000000009882583
Regarding Wiring Diagram information, refer to
HAC-232, "Wiring Diagram - Manual With 3 Control Dial Sys-
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
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 M176 (A) and
the intake door motor harness connector M58 (B).
3. Check continuity between front air control harness connector
M176 (A) terminals 8, 7 and the intake door motor harness con-
nector M58 (B) terminals 1, 6.
4. Check continuity between front air control harness connector
M176 terminals 8, 7 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
2.
CHECK FRONT AIR CONTROL FOR INTAKE AIR DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector
M176 terminal 8 and terminal 7 while placing the HVAC system
into self-diagnostic mode.
Is the inspection result normal?
YES
>> Inspect intake air door for binding or mechanical failure. If intake air door moves freely, replace the
intake air door motor. Refer to
VTL-18, "Removal and Installation"
.
NO
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
8
M58
6
Yes
7
1
Connector
Terminal
—
Continuity
M176
8
Ground
No
7
AWIIA0520ZZ
AWIIA0517ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M176
8
7
Self-diagnostic mode (opening)
Battery voltage
7
8
Self-diagnostic mode (closing)
Battery voltage
AWIIA0516ZZ
DEFROSTER DOOR MOTOR CIRCUIT
HAC-207
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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DEFROSTER DOOR MOTOR CIRCUIT
System Description
INFOID:0000000009882584
SYSTEM DESCRIPTION
Component Parts
Defroster door control system components are:
• Front air control
• Defroster door motor
• PBR (Built into defroster door motor)
• Intake sensor
System Operation
The front air control determines defroster door position based on the position of the defroster switch. When the
defroster switch is depressed, the defroster door motor rotates directing air to the defroster ducts. When any
mode other than defroster is selected, the defroster motor rotates in the opposite direction closing off air flow
to the defroster ducts.
COMPONENT DESCRIPTION
Defroster door motor
The defroster door motor is attached to the front heater & cooling
unit assembly. The front air control sends a voltage to rotate to the
defroster door directing the air flow either to the defroster ducts, or to
the floor ducts, depending on which way the voltage and ground are
applied to the motor leads. Motor rotation is conveyed to a lever
which activates the defroster door.
Defroster Door Motor Component Function Check
INFOID:0000000009882585
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DEFROSTER DOOR
1. Select vent (
) mode.
2. Rotate mode control dial to defrost mode (
).
3. Listen for defroster door position change (blower sound should change slightly).
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-207, "Defroster Door Motor Diagnosis Procedure"
.
Defroster Door Motor Diagnosis Procedure
INFOID:0000000009882586
Regarding Wiring Diagram information, refer to
HAC-232, "Wiring Diagram - Manual With 3 Control Dial Sys-
SYMPTOM:
• Defroster door does not change.
• Defroster door motor does not operate normally.
1.
CHECK DEFROSTER DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
WJIA0592E
HAC-208
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
DEFROSTER DOOR MOTOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M176 (A) and
the defroster door motor harness connector M144 (B).
3. Check continuity between front air control harness connector
M176 (A) terminals 19, 20 and the defroster door motor harness
connector M144 (B) terminals 1, 6.
4. Check continuity between front air control harness connector
M176 terminals 19, 20 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
2.
CHECK FRONT AIR CONTROL FOR DEFROSTER DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Press the mode switch to the VENT (
) mode.
4. Check voltage between front air control harness connector
M176 terminal 19 and terminal 20 while pressing the defroster
switch (
).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
3.
CHECK DEFROSTER DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M176 (A).
3. Check continuity between front air control harness connector
M176 (A) terminals 15, 2 and the defroster door motor harness
connector M144 (B) terminals 2, 3.
4. Check continuity between front air control harness connector
M176 terminal 2, 15 and ground.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
19
M144
1
Yes
20
6
Connector
Terminal
—
Continuity
M176
19
Ground
No
20
AWIIA0528ZZ
AWIIA0524ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M176
19
20
Following defroster switch (
) on
Battery voltage
20
19
Following defroster switch (
) off
Battery voltage
AWIIA0523ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
2
M144
3
Yes
15
2
AWIIA0955ZZ
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