Nissan Frontier D22. Instruction — part 829
MTC-38
TROUBLE DIAGNOSIS
3.
CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT
1.
Disconnect blower motor harness connector.
2.
Check voltage between blower motor harness connector M62
terminal 1 and ground.
Does battery voltage exist?
Yes
>> GO TO 4.
No
>> Check the following.
●
If NG, repair harness or connector.
–
Harness for open between blower motor and fuse
block (J/B).
–
Harness connectors M27 and M62
4.
CHECK BLOWER MOTOR GROUND CIRCUIT
1.
Disconnect blower motor harness connector.
2.
Turn fan control knob to 4-speed.
3.
Check continuity between blower motor harness connector M62
terminal 2 (L/W) and ground.
OK or NG
OK
>> GO TO 5.
NG
>> Check the following. If NG, repair harness or connector.
●
Harness for open between blower motor and ground.
●
Harness connectors M57 and M62
5.
CHECK BLOWER MOTOR
1.
Disconnect blower motor harness connector.
2.
Apply 12 volts to blower motor terminal 1 and ground to blower
motor terminal 2.
Does blower motor rotate?
Yes
>> Reconnect blower motor connector and go to
"Trouble Diagnosis Procedure for Blower Motor"
No
>> Replace blower motor.
AHA485A
Continuity should exist.
WJIA0281E
AHA455A
TROUBLE DIAGNOSIS
MTC-39
C
D
E
F
G
H
I
K
L
M
A
B
MTC
6.
CHECK FAN RESISTOR
1.
Disconnect fan resistor harness connector M61.
2.
Check resistance between fan resistor terminals.
OK or NG
OK
>> GO TO 7.
NG
>> Replace fan resistor.
7.
CHECK FAN SWITCH
Disconnect fan switch harness connector M57 and check continuity
between terminals at each fan switch position.
OK or NG
OK
>> GO TO 8.
NG
>> Replace fan switch.
Terminal No.
Resistance
Ω
(Approx.)
(+)
(–)
1
2
0.2 - 0.3
3
0.8 - 1.0
4
2.0 - 2.4
AHA458A
AHA456A
AHA457A
MTC-40
TROUBLE DIAGNOSIS
8.
CHECK FAN SWITCH GROUND
1.
Disconnect fan switch harness connector M57.
2.
Check continuity between fan switch harness connector terminal
6 and ground.
OK or NG
OK
>> Check the following.
●
If NG, repair harness or connectors.
–
Harness connectors M57, M61 and M62
–
Harness for open or short between blower motor and
fan switch, fan resistor
NG
>> Repair harness or connector.
9.
REPLACE FUSE
1.
Replace fuse(s).
2.
Activate the blower motor system.
Do the fuses blow when the front blower motor is activated?
Yes
>> GO TO 10.
No
>> INSPECTION END
10.
CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR A SHORT
1.
Disconnect battery cable and blower motor harness connector M62.
2.
Check continuity between front blower motor harness connector M62 terminal 1 (L) and ground.
Does continuity exist?
Yes
>> Check the following. If NG, repair harness or connector.
●
Harness connectors M27 and M62
●
Harness for short between blower motor and fuse block (J/B).
No
>> Check front blower motor. Refer to
. If necessary, clear intake unit. If OK,
replace front blower motor.
Continuity should exist.
AHA078A
WHA311
TROUBLE DIAGNOSIS
MTC-41
C
D
E
F
G
H
I
K
L
M
A
B
MTC
ELECTRICAL COMPONENTS INSPECTION
Fan Switch
Check continuity between terminals at each switch position.
Blower Motor
Confirm smooth rotation of the blower motor.
●
Check that there are no foreign particles inside the intake unit.
Fan Resistor
Check resistance between terminals.
AHA456A
AHA457A
AHA547A
Terminal No.
Resistance
Ω
(Approx.)
(+)
(–)
1
2
0.2 - 0.3
3
0.8 - 1.0
4
2.0 - 2.4
AHA458A
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