Nissan Frontier. Instruction — part 907
HAC-182
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
BLOWER MOTOR
BLOWER MOTOR
System Description
INFOID:0000000009478394
Component Parts
Blower speed control system components are:
• Front air control
• Front blower motor resistor
• Front blower motor
• Front blower relay
• Front blower switch
System Operation
COMPONENT DESCRIPTION
Blower Motor Resistor
The front blower motor resistor (1) is located on the heater and cool-
ing unit assembly. The front blower motor resistor grounds the front
blower motor through a series of 1, 2, or 3 resistors, depending upon
speed selected. For high speed operation the front blower motor
resistor is circumvented and the front blower motor grounds directly.
Front Blower Motor Component Function Check
INFOID:0000000009478395
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-183, "Front Blower Motor Diagnosis Procedure"
.
AWIIA0272GB
AWIIA1196ZZ
BLOWER MOTOR
HAC-183
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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Front Blower Motor Diagnosis Procedure
INFOID:0000000009478396
Regarding Wiring Diagram information, refer to
HAC-200, "Wiring Diagram - With Type 2"
.
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
1.
DIAGNOSTIC PROCEDURE
1. Turn ignition switch ON.
2. Turn the front blower switch to each of its four speeds.
Does blower motor rotate normally at each speed?
YES or NO
YES
>> Inspection End.
NO
>> 1. Does not rotate at any speed, GO TO 2.
2. Does not rotate at 1 - 3 speed, GO TO 13.
3. Does not rotate at 4 speed, GO TO 16.
2.
CHECK FUSES
1. Check 15A fuses (Nos. 24 and 27, located in the fuse and fusible link box). Refer to
.
2. Check 10A fuse [No. 8, located in the fuse block (J/B)]. Refer to
Is inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 8.
3.
CHECK FRONT BLOWER MOTOR POWER SUPPLY
WJIA1503E
HAC-184
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
BLOWER MOTOR
1. Turn ignition switch OFF.
2. Disconnect front blower motor harness connector.
3. Turn ignition switch ON.
4. Select any front blower speed except OFF.
5. Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
Is inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 4.
4.
CHECK FRONT BLOWER MOTOR RELAY
1. Turn Ignition switch OFF.
2. Check front blower motor relay. Refer to
HAC-186, "Front Blower Motor Component Inspection"
Is inspection result normal?
YES
>> GO TO 5.
NO
>> Replace front blower motor relay.
5.
CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (SWITCH SIDE)
Check voltage between front blower motor relay harness connector
E54 terminals 7 and 5 and ground.
Is inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)
1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness con-
nector E54 terminal 1 and ground.
Is inspection result normal?
YES
>> GO TO 7.
NO
>> Repair or replace harness as necessary.
2 - Ground
: Battery voltage
WJIA1331E
A
Condition
Voltage (Ap-
prox.)
(+)
Front blower mo-
tor relay connec-
tor
Terminal
(-)
E54
5 Ground
Blower motor
relay power
supply
Battery voltage
E54
7 Ground
Blower motor
relay power
supply
Battery voltage
WJIA1634E
A
Condition
Voltage (Ap-
prox.)
(+)
Front blower mo-
tor relay connec-
tor
Terminal
(-)
E54
1 Ground
Blower motor
relay power
supply (coil
side)
Battery voltage
WJIA1991E
BLOWER MOTOR
HAC-185
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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7.
CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Check continuity between front blower motor relay harness con-
nector E54 terminals 6 and 3 and front blower motor harness
connector M62 terminal 2.
Is inspection result normal?
YES
>> Repair the blower motor ground circuit as necessary.
NO
>> Repair harness or connector between the front blower
motor relay and the front blower motor.
8.
REPLACE FUSE
.
Does fuse No. 24 or 27 open when the front blower motor is turned on?
YES or NO
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
REPLACE FUSE
.
Does fuse No. 8 open when the ignition switch is turned ON?
YES or NO
YES
>> Repair or replace harness as necessary.
NO
>> Inspection End.
10.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Check continuity between front blower motor harness connector
M62 terminal 2 and ground.
Is inspection result normal?
YES
>> GO TO 11.
NO
>> Repair or replace harness as necessary.
11.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT FOR SHORT
1. Disconnect front blower motor relay connector.
2. Check continuity between the front blower motor relay harness
connector E54 terminal 7 and terminal 5 and ground.
Is inspection result normal?
YES
>> Check front blower motor. Refer to
Blower Motor Component Inspection"
NO
>> Repair harness or connector.
12.
CHECK FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Check front blower motor. Refer to
HAC-186, "Front Blower Motor Component Inspection"
3, 6 - 2
: Continuity should exist.
WJIA1333E
2 - Ground
: Continuity should not exist.
WJIA0649E
7, 5 - Ground
: Continuity should not exist.
WJIA1334E
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