Nissan Titan A60. Manual — part 612
BLOWER MOTOR CONTROL SYSTEM
HAC-131
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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HAC
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BLOWER MOTOR CONTROL SYSTEM
System Description
INFOID:0000000006164766
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:0000000006164767
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:0000000006164768
Regarding Wiring Diagram information, refer to
HAC-155, "Wiring Diagram - Manual 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
BLOWER MOTOR CONTROL SYSTEM
HAC-133
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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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-135, "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
M180 (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
5 - Ground
: Battery voltage
WJIA1886E
3 - 2
: Continuity should exist.
WJIA1360E
3 - 4
: Continuity should exist.
AWIIA0175ZZ
13 - 3
: Continuity should exist.
AWIIA0413ZZ
HAC-134
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
BLOWER MOTOR CONTROL SYSTEM
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.
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
M180 (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-131, "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
2 - Ground
: Battery voltage
AWIIA1386ZZ
4 - Ground
: Continuity should not exist.
AWIIA0177ZZ
13 - 3
: Continuity should exist.
AWIIA0414ZZ
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