Nissan Terrano r20e. Instruction — part 352
Diagnostic Procedure 1
SYMPTOM: Blower motor does not rotate.
I
Perform PRELIMINARY CHECK 2 before referring to the
following flow chart.
Check if blower motor rotates properly at
each fan speed.
Conduct check as per flow chart at left.
2 3 4
Eq
B
5
Eq
C
(Go to next page.)
1
CHECK POWER SUPPLY FOR BLOWER
MOTOR.
I
Disconnect blower motor harness con-
nector.
I
Turn ignition switch to ACC or ON posi-
tion.
Do approx. 12 volts exist between blower
motor harness terminal No.
q
1
and body
ground?
OK
E
NG
Check 15A fuses at fuse
block.
(Refer to “POWER SUP-
PLY ROUTING” in EL sec-
tion and “Wiring Diagram”.)
I
Put fan switch to ON position.
Check circuit continuity between blower
motor harness terminal No.
q
2
and body
ground.
OK
E
NG
Reconnect blower motor
harness connector.
CHECK BLOWER MOTOR.
(Refer to Electrical Components Inspec-
tion.)
NG
Replace blower motor.
CHECK BLOWER MOTOR CIRCUIT
BETWEEN BLOWER MOTOR AND
RESISTOR.
I
Put fan switch to OFF position.
Do approx. 12 volts exist between resistor
harness terminal No.
q
1
and body ground?
OK
E
NG
Disconnect blower motor
and resistor harness con-
nectors.
Note
I
Turn ignition switch OFF.
Check circuit continuity
between blower motor har-
ness terminal No.
q
2
and
resistor harness terminal
No.
q
1
.
q
A
(Go to next page.)
Note:
If the result is NG after checking circuit continuity, repair har-
ness or connector.
INCIDENT
Flow chart
No.
1
Fan fails to rotate.
1
2
Fan does not rotate at
1-speed.
2
3
Fan does not rotate at
2-speed.
3
4
Fan does not rotate at
3-speed.
4
5
Fan does not rotate at
4-speed.
5
YHA408
YHA409
YHA410
YHA411
H
H
H
H
H
H
TROUBLE DIAGNOSES
HA-52
q
A
1
q
B
2
3
4
q
C
5
H
CHECK RESISTOR AFTER DISCONNECT-
ING IT.
(Refer to Electrical Components Inspection.)
OK
H
NG
Replace resistor.
Reconnect resistor harness connector.
1
2
3
4
CHECK FAN SWITCH CIRCUIT.
Do approx. 12 volts exist between each fan switch har-
ness terminal and body ground?
NG
H
OK
2
3
4
5
Note
Check circuit continuity between
fan switch and resistor.
CHECK FAN SWITCH AFTER DISCON-
NECTING IT.
(Refer to Electrical Components Inspection.)
OK
E
NG
Replace fan switch.
Note
Check circuit continuity between fan switch
harness terminal No.
q
1
and body ground.
OK
Replace blower motor.
Note:
If the result is NG after checking circuit continuity, repair har-
ness or connector.
Flow
chart
No.
Terminal No.
Voltage
!
@
q
2
Body
ground
Approx.
12V
q
3
q
4
q
5
YHA412
YHA413
YHA414
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
Diagnostic Procedure 1 (Cont’d)
HA-53
Diagnostic Procedure 2
SYMPTOM: Magnet clutch does not engage when A/C
switch and fan switch are ON.
I
Perform PRELIMINARY CHECK 1 before referring to the
following flow chart.
CHECK POWER SUPPLY FOR COM-
PRESSOR.
Disconnect compressor harness connec-
tor.
I
Turn ignition switch ON and A/C switch
ON.
Do approx. 12 volts exist between com-
pressor harness terminal No.
q
1
and body
ground?
OK
E
NG
CHECK A/C RELAY
OPERATION.
Do approx. 12 volts exist
between A/C relay harness
terminal No.
q
5
and body
ground.
OK
NG
Check magnet clutch coil.
OK
q
A
q
B
Replace magnet clutch.
Refer to COMPRESSOR — Model DKV-
14C (ZEXEL make).
Note:
If the result is NG after checking circuit continuity, repair harness or connec-
tor.
YHA415
YHA416
H
H
H
H
TROUBLE DIAGNOSES
HA-54
q
A
q
B
I
Turn ignition switch OFF.
Disconnect A/C relay harness connec-
tor.
CHECK POWER SUPPLY
FOR A/C RELAY.
Disconnect A/C relay.
Do approx. 12 volts exist
between A/C relay harness
connector terminal No.
q
3
and
body ground?
NG
OK
Note
Check circuit continuity between A/C
relay harness connector terminal No.
q
5
and compressor harness connector
terminal No.
q
1
.
If NG, check harness connectors.
H
CHECK POWER SUPPLY
CIRCUIT AND 10A FUSE AT
FUSE BLOCK.
(Refer to “POWER SUPPLY
ROUTING” in EL section and
Wiring Diagram.)
I
Turn ignition switch ON.
CHECK POWER SUPPLY FOR A/C
RELAY (Coil side).
Do approx. 12 volts exist between A/C
relay harness connector terminal No.
q
2
and body ground?
H
E
NG
CHECK POWER SUPPLY
FOR A/C CONTROL PANEL.
Disconnect A/C control panel
harness connector.
Do approx. 12 volts exist
between A/C control panel
harness connector terminal
No.
q
1
and body ground?
NG
OK
F
q
C
(Go to next page.)
CHECK POWER SUPPLY
CIRCUIT AND 10A FUSE AT
FUSE BLOCK.
(Refer to “POWER SUPPLY
ROUTING” in EL section and
Wiring Diagram.)
Note:
If the result is NG after checking circuit continuity, repair harness or connec-
tor.
YHA417
YHA418
YHA419
YHA420
H
H
H
H
H
H
TROUBLE DIAGNOSES
Diagnostic Procedure 2 (Cont’d)
HA-55
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