Nissan Titan A60. Manual — part 631
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:0000000006164822
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:0000000006164823
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:0000000006164824
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
DEFROSTER DOOR MOTOR CIRCUIT
HAC-209
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
4.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
1. Check continuity between front air control harness connector
M176 (A) terminal 25 and defroster door motor harness connec-
tor M144 (B) terminal 4.
2. Check continuity between front air control harness connector
M176 terminal 25 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness as necessary.
5.
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
M176 terminals 2, 15.
Connector
Terminal
—
Continuity
M176
2
Ground
No
15
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
25
M144
4
Yes
AWIIA0534ZZ
Connector
Terminal
—
Continuity
M176
25
Ground
No
AWIIA0533ZZ
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M176
2
M176
15
5 Volts
AWIIA0494ZZ
HAC-210
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
DEFROSTER DOOR MOTOR CIRCUIT
4. Check voltage between front air control harness connector
M176 terminal 25 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace front air control. Refer to
6.
CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL
1. Reconnect the defroster door motor harness connector M144.
2. Check voltage between front air control harness connector
M176 terminal 25 and ground.
Is the inspection result normal?
YES
>> Inspect defroster door for binding or mechanical failure.
If defroster door moves freely, replace front air control.
VTL-8, "Removal and Installation"
NO
>> Replace the defroster door motor. Refer to
.
Connector
Terminal
—
Voltage (Approx.)
M176
25
Ground
0 Volts
AWIIA0532ZZ
Connector
Terminal
—
Voltage (Approx.)
M176
25
Ground
0.2 to 4.8 Volts
AWIIA0532ZZ
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