Nissan Titan A60. Manual — part 585
MODE DOOR MOTOR
HAC-23
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet as indicated by
the front air control. Motor rotation is conveyed to a link which acti-
vates the mode door.
Mode Door Motor Component Function Check
INFOID:0000000006164686
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Press each mode switch and press the
(DEF) switch. Each position indicator should illuminate.
2. Confirm that discharge air comes out according to the air distribution table. Refer to
.
NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF (
) or D/F (
) is selected.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-23, "Mode Door Motor Diagnosis Procedure"
.
Mode Door Motor Diagnosis Procedure
INFOID:0000000006708574
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
1.
CHECK MODE DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE
1. Turn ignition switch ON.
2. Using CONSULT-III, check "MODE FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
.
3. Observe "MODE FDBCK" voltage while cycling front air control mode switch through all modes.
Is the inspection result normal?
YES
>> • Mode door motor is OK.
• Inspect mode door for mechanical failure. Refer to
VTL-19, "Removal and Installation"
NO
>> GO TO 2.
2.
CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
WJIA0587E
Monitor Item
Condition
Results
MODE FDBCK
Cycle mode switch through all modes, D/F
(
), VENT (
), B/L (
), and FOOT(
)
Voltage varies between D/F (
) and VENT (
), and
between VENT (
) and B/L (
).
HAC-24
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M49 (A) and
the mode door motor harness connector M142 (B).
3. Check continuity between front air control harness connector
M49 (A) terminals 19, 20 and the mode door motor harness con-
nector M142 (B) terminals 5, 6.
4. Check continuity between front air control harness connector
M49 terminals 19, 20 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
CHECK FRONT AIR CONTROL FOR MODE DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Press the mode switch to the D/F (
) mode.
4. Check voltage between front air control harness connector M49
terminal 19 and terminal 20 while pressing the mode switch to
the VENT (
), and then the B/L (
) mode.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
4.
CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connectors.
3. Check continuity between front air control harness connector
M49 (C) terminal 3, and M50 (A) terminal 28 and the mode door
motor harness connector M142 (B) terminals 1, 3.
4. Check continuity between front air control harness connector
M49 (C) terminal 3, M50 (A) terminal 28 and ground.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
19
M142
5
Yes
20
6
Connector
Terminal
—
Continuity
M49
19
Ground
No
20
AWIIA0364ZZ
AWIIA0361ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
19
20
D/F (
) mode to VENT (
) mode
Battery voltage
20
19
VENT (
) mode to B/L (
) mode
Battery voltage
AWIIA0360ZZ
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M49 (C)
3
M142
3
Yes
M50 (A)
28
1
AWIIA0368ZZ
MODE DOOR MOTOR
HAC-25
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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
M49 (A) terminal 7 and mode door motor harness connector
M142 (B) terminal 2.
2. Check continuity between front air control harness connector
M49 terminal 7 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 7 and ground.
Connector
Terminal
—
Continuity
M49 (C)
3
Ground
No
M50 (A)
28
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
7
M142
2
Yes
AWIIA0371ZZ
Connector
Terminal
—
Continuity
M49
7
Ground
No
AWIIA0370ZZ
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M50
28
M49
3
5 Volts
AWIIA0813ZZ
HAC-26
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
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 mode door motor harness connector M142.
2. Check voltage between front air control harness connector M49
terminal 7 and ground.
Is the inspection result normal?
YES
>> Inspect mode door for binding or mechanical failure. If
mode door moves freely, replace front air control. Refer
to
VTL-8, "Removal and Installation"
.
NO
>> Replace the mode door motor. Refer to
.
Connector
Terminal
—
Voltage (Approx.)
M49
7
Ground
0 Volts
AWIIA0369ZZ
Connector
Terminal
—
Voltage (Approx.)
M49
7
Ground
0.2 to 4.8 Volts
AWIIA0369ZZ
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