Nissan Titan A60. Instruction — part 611
DEFROSTER DOOR MOTOR CIRCUIT
HAC-127
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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HAC
N
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DEFROSTER DOOR MOTOR CIRCUIT
System Description
INFOID:0000000006164763
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:0000000006164764
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:0000000006164765
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-III, 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
DEFROSTER DOOR MOTOR CIRCUIT
HAC-129
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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 M180 (C)
and M181 (A).
3. Check continuity between front air control harness connector
M180 (C) terminal 3, and M181 (A) terminal 28 and the defroster
door motor harness connector M144 (B) terminals 2, 3.
4. Check continuity between front air control harness connector M180 (C) terminal 3, M181 (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
M180 (A) terminal 10 and defroster door motor harness connec-
tor M144 (B) terminal 4.
2. Check continuity between front air control harness connector
M180 terminal 10 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
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M180 (C)
3
M144
2
Yes
M181 (A)
28
3
Connector
Terminal
—
Continuity
M180 (C)
3
Ground
No
M181 (A)
28
AWIIA0393ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
M180
10
M144
4
Yes
AWIIA0410ZZ
Connector
Terminal
—
Continuity
M180
10
Ground
No
AWIIA0409ZZ
HAC-130
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
DEFROSTER DOOR MOTOR CIRCUIT
1. Reconnect front air control harness connectors.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector
M180 (B) terminal 3, and M181 (A) terminal 28.
4. Check voltage between front air control harness connector
M180 terminal 10 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 defroster door motor harness connector M144.
2. Check voltage between front air control harness connector
M180 terminal 10 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
.
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M181
28
M180
3
5 Volts
AWIIA0407ZZ
Connector
Terminal
—
Voltage (Approx.)
M180
10
Ground
0 Volts
AWIIA0408ZZ
Connector
Terminal
—
Voltage (Approx.)
M180
10
Ground
0.2 to 4.8 Volts
AWIIA0408ZZ
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