Nissan Titan. Instruction — part 406
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
BLOWER MOTOR CONTROL SYSTEM
HAC-131
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
BLOWER MOTOR CONTROL SYSTEM
System Description
INFOID:0000000009882528
SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
• Front air control
• Variable blower control
• Front blower motor relay
• Front blower motor
• Ambient sensor
• Intake sensor
System Operation
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control is located on the cooling unit. The vari-
able blower control receives a gate voltage from the front air control
to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).
Front Blower Motor Component Function Check
INFOID:0000000009882529
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Rotate the blower control dial clockwise once. Blower motor should operate in low speed.
2. Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are
checked.
Is the inspection result normal?
YES
>> Inspection End.
WJIA1385E
WJIA0559E
HAC-132
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
BLOWER MOTOR CONTROL SYSTEM
NO
>> Go to diagnosis procedure. Refer to
HAC-132, "Front Blower Motor Diagnosis Procedure"
.
Front Blower Motor Diagnosis Procedure
INFOID:0000000009882530
Regarding Wiring Diagram information, refer to
HAC-155, "Wiring Diagram - Instruction With 2 Control Dial Sys-
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
1.
CHECK FUSES
Check 20A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 9.
2.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Turn ignition switch ON.
4. Press the A/C switch.
5. Rotate blower control dial to maximum speed.
6. Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 3.
3.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
AWIIA1115GB
Fuses are good.
2 - Ground
: Battery voltage
WJIA1331E
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