Nissan Titan. Instruction — part 383
INTAKE DOOR MOTOR
HAC-37
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
4. Check continuity between front air control harness connector
M49 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 M49
terminal 21 and terminal 22 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"
.
Connector
Terminal
—
Continuity
M49
21
Ground
No
22
AWIIA0398ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
21
22
Self-diagnostic mode (opening)
Battery voltage
22
21
Self-diagnostic mode (closing)
Battery voltage
AWIIA0397ZZ
HAC-38
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
DEFROSTER DOOR MOTOR CIRCUIT
DEFROSTER DOOR MOTOR CIRCUIT
System Description
INFOID:0000000009882459
SYSTEM DESCRIPTION
Component Parts
Defroster door control system components are:
• Front air control
• Defroster door motor
• PBR (Built into defroster door motor)
• In-vehicle sensor
• Ambient sensor
• Optical 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.
In the AUTO mode, the front air control determines defroster door position based on the ambient temperature,
the intake air temperature and the in-vehicle temperature.
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 foot 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:0000000009882460
INSPECTION FLOW
WJIA1354E
WJIA0592E
DEFROSTER DOOR MOTOR CIRCUIT
HAC-39
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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-39, "Defroster Door Motor Diagnosis Procedure"
Defroster Door Motor Diagnosis Procedure
INFOID:0000000009882461
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
SYMPTOM:
• Defroster door does not change.
• Defroster door motor does not operate normally.
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 M49 (A) and
the defroster door motor harness connector M144 (B).
3. Check continuity between front air control harness connector
M49 (A) terminals 23, 24 and the defroster door motor harness
connector M144 (B) terminals 1, 6.
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
M49
23
M144
1
Yes
24
6
AWIIA0406ZZ
HAC-40
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
DEFROSTER DOOR MOTOR CIRCUIT
4. Check continuity between front air control harness connector
M49 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 M49
terminal 23 and terminal 24 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"
.
4.
CHECK DEFROSTER DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connectors M49 (C) and
M50 (A).
3. Check continuity between front air control harness connector
M49 (C) terminal 3, and M50 (A) terminal 28 and the defroster
door motor harness connector M144 (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
Connector
Terminal
—
Continuity
M49
23
Ground
No
24
AWIIA0403ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
23
24
Following defroster switch (
) on
Battery voltage
24
23
Following defroster switch (
) off
Battery voltage
AWIIA0404ZZ
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M49 (C)
3
M144
2
Yes
M50 (A)
28
3
Connector
Terminal
—
Continuity
M49 (C)
3
Ground
No
M50 (A)
28
AWIIA0393ZZ
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