Infiniti QX4 (R50). Manual — part 476
8
CHECK POWER SUPPLY FOR BLOWER MOTOR
Disconnect blower motor harness connector.
Do approx. 12 volts exist between blower motor harness terminal No. 1 and body ground?
RHA091G
Yes or No
Yes
©
GO TO 9.
No
©
Check power supply circuit and 15A fuses (Nos. 1 and 2, located in the fuse
block).
I
If OK, check for open circuit in wiring harness.
Repair or replace as necessary.
I
If NG, replace fuse and check wiring harness for short circuit.
Repair or replace as necessary.
9
CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND FAN CONTROL AMP.
Disconnect blower motor connector and auto amp. (LCU) connector.
Check circuit continuity between blower motor harness terminal No. 2 and fan control amp. harness terminal No. 3.
RHA472G
OK or NG
OK
©
Check blower motor. (Refer to HA-103.)
1. If NG, replace blower motor.
2. Go to self-diagnosis step-by-step procedure (HA-45) and perform self-diagnosis STEP
4.
Confirm that blower motor operation is normal.
NG
©
Repair harness or connector.
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-102
10
CHECK BLOWER MOTOR CIRCUIT BETWEEN BLOWER MOTOR AND AUTO AMP. (LCU)
Check circuit continuity between blower motor harness terminal No. 2 and auto amp. (LCU) harness terminal No. 34.
RHA827H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
INSPECTION END
NG
©
Repair harness or connector.
RHA941F
COMPONENT INSPECTION
NBHA0065
Blower Motor
NBHA0065S01
Confirm smooth rotation of the blower motor.
I
Ensure that there are no foreign particles inside the intake unit.
RHA828H
Fan Control Amplifier
NBHA0065S02
Check continuity between terminal Nos. 1 and 2.
Terminal No.
Continuity
1 - 2
Yes
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-103
Magnet Clutch
TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH
=NBHA0095
SYMPTOM:
I
Magnet clutch does not engage.
Inspection Flow
NBHA0095S01
Without Navigation System
NBHA0095S0101
SHA249F
*1: STEP-BY-STEP PROCEDURE
*2: HA-129
*3: HA-132
*4: HA-135
*5: HA-141
*6: STEP-BY-STEP PROCEDURE
(HA-45), see No. 13.
*7: HA-106
*8: HA-150
*9: HA-155
*10: HA-66
*11: HA-45
*12: HA-66
*13: HA-65
*14: HA-139
TROUBLE DIAGNOSES
Magnet Clutch
HA-104
With Navigation System
NBHA0095S0102
RHA876H
*1: STEP-BY-STEP PROCEDURE
*2: HA-129
*3: HA-132
*4: HA-135
*5: HA-141
*6: STEP-BY-STEP PROCEDURE
(HA-45), see No. 13.
*7: HA-106
*8: HA-150
*9: HA-155
*10: HA-66
*11: HA-45
*12: HA-66
*13: HA-65
*14: HA-139
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Magnet Clutch (Cont’d)
HA-105
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