Nissan Titan A60. Manual — part 589
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:0000000006708578
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-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 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
DEFROSTER DOOR MOTOR CIRCUIT
HAC-41
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Check continuity between front air control harness connector
M49 (A) terminal 10 and defroster door motor harness connec-
tor M144 (B) terminal 4.
2. Check continuity between front air control harness connector
M49 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
1. Reconnect front air control harness connectors.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M49
(B) terminal 3, and M50 (A) terminal 28.
4. Check voltage between front air control harness connector M49
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
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
10
M144
4
Yes
AWIIA0410ZZ
Connector
Terminal
—
Continuity
M49
10
Ground
No
AWIIA0409ZZ
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M50
28
M49
3
5 Volts
AWIIA0407ZZ
Connector
Terminal
—
Voltage (Approx.)
M49
10
Ground
0 Volts
AWIIA0408ZZ
HAC-42
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
DEFROSTER DOOR MOTOR CIRCUIT
1. Reconnect the defroster door motor harness connector M144.
2. Check voltage between front air control harness connector M49
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
.
Connector
Terminal
—
Voltage (Approx.)
M49
10
Ground
0.2 to 4.8 Volts
AWIIA0408ZZ
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