Nissan Titan. Instruction — part 405
INTAKE DOOR MOTOR
HAC-125
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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HAC
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INTAKE DOOR MOTOR
System Description
INFOID:0000000009882522
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)
• Ambient 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.
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:0000000009882523
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-126
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
INTAKE DOOR MOTOR
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-126, "Intake Door Motor Diagnosis Procedure"
.
Intake Door Motor Diagnosis Procedure
INFOID:0000000009882524
Regarding Wiring Diagram information, refer to
HAC-155, "Wiring Diagram - Instruction With 2 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 M180 (A) and
the intake door motor harness connector M58 (B).
3. Check continuity between front air control harness connector
M180 (A) terminals 21, 22 and the intake door motor harness
connector M58 (B) terminals 1, 6.
4. Check continuity between front air control harness connector
M180 terminals 21, 22 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
M180 terminal 21 and terminal 22 while placing the HVAC sys-
tem 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
M180
21
M58
6
Yes
22
1
Connector
Terminal
—
Continuity
M180
21
Ground
No
22
AWIIA0401ZZ
AWIIA0398ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M180
21
22
Self-diagnostic mode (opening)
Battery voltage
22
21
Self-diagnostic mode (closing)
Battery voltage
AWIIA0397ZZ
DEFROSTER DOOR MOTOR CIRCUIT
HAC-127
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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DEFROSTER DOOR MOTOR CIRCUIT
System Description
INFOID:0000000009882525
SYSTEM DESCRIPTION
Component Parts
Defroster door control system components are:
• Front air control
• Defroster door motor
• Position balanced resistor (PBR) (Built into defroster door motor)
• Ambient sensor
• 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:0000000009882526
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DEFROSTER DOOR
1. Select vent (
) mode.
2. Press the defrost switch (
). Defroster indicator should illuminate.
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-127, "Defroster Door Motor Diagnosis Procedure"
Defroster Door Motor Diagnosis Procedure
INFOID:0000000009882527
Regarding Wiring Diagram information, refer to
HAC-155, "Wiring Diagram - Instruction With 2 Control Dial Sys-
SYMPTOM:
• Defroster door does not change.
• Defroster door motor does not operate normally.
WJIA0592E
HAC-128
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
DEFROSTER DOOR MOTOR CIRCUIT
1.
CHECK DEFROSTER DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE
1. Turn ignition switch ON.
2. Using CONSULT, check "DEF FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
.
3. Observe "DEF FDBCK" voltage while cycling front air control mode switch through all modes and pressing
DEF switch.
Is the inspection result normal?
YES
>> • Defroster door motor is OK.
• Inspect defroster door for mechanical failure. Refer to
VTL-17, "Removal and Installation"
.
NO
>> GO TO 2.
2.
CHECK DEFROSTER DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M180 (A) and
the defroster door motor harness connector M144 (B).
3. Check continuity between front air control harness connector
M180 (A) terminals 23, 24 and the defroster door motor harness
connector M144 (B) terminals 1, 6.
4. Check continuity between front air control harness connector
M180 terminals 23, 24 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
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
M180 terminal 23 and terminal 24 while pressing the defroster
switch (
).
Is the inspection result normal?
YES
>> GO TO 4.
Monitor Item
Condition
Results
DEF FDBCK
Cycle mode switch through all modes, D/F
(
), VENT (
), B/L (
), FOOT(
), and
press DEF (
)
Voltage varies between 0.2 and 4.8 volts.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M180
23
M144
1
Yes
24
6
Connector
Terminal
—
Continuity
M180
23
Ground
No
24
AWIIA0406ZZ
AWIIA0403ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M180
23
24
Following defroster switch (
) on
Battery voltage
24
23
Following defroster switch (
) off
Battery voltage
AWIIA0404ZZ
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