Nissan Titan. Instruction — part 385
BLOWER MOTOR CONTROL SYSTEM
HAC-45
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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
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.
AWIIA1115GB
Fuses are good.
2 - Ground
: Battery voltage
WJIA1331E
5 - Ground
: Battery voltage
WJIA1886E
HAC-46
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
4.
CHECK FRONT BLOWER MOTOR RELAY
Turn ignition switch OFF.
Check front blower motor relay. Refer to
HAC-48, "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 M122 (B) terminal 4.
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
M49 (B) terminal 13 and variable blower control harness con-
nector M122 (A) terminal 3.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness con-
nector M107 terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair front blower motor ground circuit or connector.
3 - 2
: Continuity should exist.
WJIA1360E
3 - 4
: Continuity should exist.
AWIIA0175ZZ
13 - 3
: Continuity should exist.
AWIIA0413ZZ
2 - Ground
: Battery voltage
AWIIA1386ZZ
BLOWER MOTOR CONTROL SYSTEM
HAC-47
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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 M122 terminal 4 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
M49 (B) terminal 13 and variable blower control harness con-
nector M122 (A) terminal 3.
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-48, "Front Blower Motor Component Inspection"
.
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
Check continuity between front blower motor harness connector
M62 (B) terminal 1 and variable blower control harness connector
M122 (A) terminal 2.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Repair harness or connector.
14.
CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT
4 - Ground
: Continuity should not exist.
AWIIA0177ZZ
13 - 3
: Continuity should exist.
AWIIA0414ZZ
1 - 2
: Continuity should exist.
AWIIA0179ZZ
HAC-48
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
Check continuity between variable blower control harness connector
M122 terminal 1 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:0000000009882465
COMPONENT INSPECTION
Check continuity between terminals 3, and 5 by supplying 12 volts
and ground to coil side terminals 1 and 2 of relay.
Front Blower Motor
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.
1 - Ground
: Continuity should exist.
AWIIA0180ZZ
WJIA1401E
WJIA1508E
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