Nissan Titan. Manual — part 427
BLOWER MOTOR CONTROL SYSTEM
HAC-213
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
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A
B
HAC
N
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1. Turn ignition switch OFF.
2. Disconnect front blower motor relay.
3. Check voltage between front blower motor relay harness con-
nector M107 terminal 5 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK FRONT BLOWER MOTOR RELAY
Turn ignition switch OFF.
Check front blower motor relay. Refer to
HAC-215, "Front Blower Motor Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace front blower motor relay.
5.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
Check continuity between front blower motor relay harness connec-
tor M107 terminal 3 and front blower motor harness connector M62
terminal 2.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1. Disconnect variable blower control harness connector.
2. Check continuity between front blower motor relay harness con-
nector M107 (A) terminals 3 and variable blower control harness
connector M121 (B) terminal 1.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1. Disconnect front air control connector.
2. Check continuity between front air control harness connector
M177 (B) terminal 40 and variable blower control harness con-
nector M121 (A) terminal 2.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY
5 - Ground
: Battery voltage
WJIA1886E
3 - 2
: Continuity should exist.
WJIA1360E
3 - 1
: Continuity should exist.
AWIIA1387ZZ
40 - 2
: Continuity should exist.
AWIIA0537ZZ
HAC-214
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
BLOWER MOTOR CONTROL SYSTEM
1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness con-
nector M107 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair front blower motor ground circuit or connector.
9.
REPLACE FUSES
1. Replace fuses.
2. Activate the front blower motor.
Does the fuse blow?
YES
>> GO TO 10.
NO
>> Inspection End.
10.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector and variable blower
control connector.
3. Check continuity between variable blower control harness con-
nector M121 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1. Disconnect front air control connector.
2. Check continuity between front air control harness connector
M177 (B) terminal 40 and variable blower control harness con-
nector M121 (A) terminal 2.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Repair harness or connector.
12.
CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to
HAC-211, "Front Blower Motor Component Function Check"
.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace front blower motor. Refer to
VTL-12, "Removal and Installation"
13.
CHECK BLOWER MOTOR GROUND CIRCUIT
1 - Ground
: Battery voltage
AWIIA1388ZZ
1 - Ground
: Continuity should not exist.
AWIIA0539ZZ
40 - 2
: Continuity should exist.
AWIIA0537ZZ
BLOWER MOTOR CONTROL SYSTEM
HAC-215
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Check continuity between front blower motor harness connector
M62 (B) terminal 1 and variable blower control harness connector
M121 (A) terminal 3.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Repair harness or connector.
14.
CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT
Check continuity between variable blower control harness connector
M121 terminal 4 and ground.
Is the inspection result normal?
YES
>> Replace variable blower control. Refer to
.
NO
>> Repair harness or connector.
Front Blower Motor Component Inspection
INFOID:0000000009882590
COMPONENT INSPECTION
Check continuity between terminals by supplying 12 volts and
ground to coil side terminals of relay.
Front Blower Motor
1 - 3
: Continuity should exist.
AWIIA0540ZZ
4 - Ground
: Continuity should exist.
AWIIA0541ZZ
WJIA1401E
HAC-216
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
BLOWER MOTOR CONTROL SYSTEM
Confirm smooth rotation of the blower motor.
• Ensure that there are no foreign particles inside the blower unit.
• Apply 12 volts to terminal 2 and ground to terminal 1 and verify that
the motor operates freely and quietly.
WJIA1508E
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