Nissan Frontier. Manual — part 890
HAC-114
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
INTAKE DOOR MOTOR
Is the inspection result normal?
YES
>> Inspect intake air door for binding or mechanical failure. If intake air door moves freely, replace the
intake air door motor. Refer to
VTL-20, "Removal and Installation"
.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
BLOWER MOTOR
HAC-115
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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HAC
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BLOWER MOTOR
System Description
INFOID:0000000009478344
Component Parts
Blower speed control system components are:
• Front air control
• Variable blower control
• Front blower motor
• Front blower motor relay
System Operation
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control (1) is located on the heater and cooling
unit assembly. The variable blower control receives a gate voltage
from the front air control to steplessly maintain the blower motor volt-
age in the 0 to 5 volt range (approx.)
⇒↓:front.
Front Blower Motor Component Function Check
INFOID:0000000009478345
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Rotate the blower control dial clockwise. Blower should operate.
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.
NO
>> Go to diagnosis procedure. Refer to
HAC-116, "Front Blower Motor Diagnosis Procedure"
.
AWIIA1209ZZ
AWIIA1225ZZ
HAC-116
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
BLOWER MOTOR
Front Blower Motor Diagnosis Procedure
INFOID:0000000009478346
Regarding Wiring Diagram information, refer to
HAC-133, "Wiring Diagram - With Type 1"
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 15A 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 12.
NO
>> GO TO 3.
3.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
AWIIA1784GB
Fuses are good.
2 - Ground
: Battery voltage
WJIA1331E
BLOWER MOTOR
HAC-117
< 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 E54 terminals 5,7 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-119, "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 E54 terminals 3, 6 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 E54 (A) terminals 3, 6 and variable blower control har-
ness connector M121 (B) terminal 4.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT
Check continuity between front blower motor relay harness connec-
tor E54 terminal 2 and ground.
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, 7 - Ground
: Battery voltage
WJIA1634E
3, 6 - 2
: Continuity should exist.
WJIA1333E
3, 6 - 4
: Continuity should exist.
AWIIA1212ZZ
2 - Ground
: Continuity should exist
AWIIA1227ZZ
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