Infiniti I35 (A33). Manual — part 540
9
CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND FAN CONTROL AMP.
Disconnect blower motor connector and fan control amp. connector.
Check circuit continuity between blower motor harness connector E102 terminal No. 2 and fan control amp. harness con-
nector M31 terminal No. 1.
RHA397H
OK or NG
OK
©
Check blower motor. (Refer to HA-74.)
1. If NG, replace blower motor.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-4.
Confirm that blower motor operation is normal.
NG
©
Repair harness or connector.
10
CHECK BLOWER MOTOR CIRCUIT BETWEEN BLOWER MOTOR AND AUTO AMP.
Check circuit continuity between blower motor harness connector E102 terminal No. 2 and auto amp. harness connector
M60 terminal No. 34.
SHA372F
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
INSPECTION END
NG
©
Repair harness or connector.
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-73
RHA941F
COMPONENT INSPECTION
NHHA0200
Blower Motor
NHHA0200S01
Confirm smooth rotation of the blower motor.
I
Ensure that there are no foreign particles inside the intake unit.
RHA787H
Fan Control Amp.
NHHA0200S02
Check continuity between terminal Nos. 2 and 3.
Ohmmeter terminal
Continuity
(+)
(−)
Terminal No.
2
3
Yes
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-74
Magnet Clutch
TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH
=NHHA0201
SYMPTOM:
I
Magnet clutch does not engage.
INSPECTION FLOW
RHA080IA
*1: FUNCTION CONFIRMATION
PROCEDURE (HA-37)
*2: HA-93
*3: HA-97
*4: HA-100
*5: HA-106
*6: FUNCTION CONFIRMATION
PROCEDURE (HA-37), see No.
13.
*10: HA-37
*11: HA-47
*12: HA-46
*13: HA-104
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Magnet Clutch
HA-75
RHA094GB
SYSTEM DESCRIPTION
=NHHA0202
Auto amplifier controls compressor operation by ambient tempera-
ture and signal from ECM.
Low Temperature Protection Control
NHHA0202S01
Auto amplifier will turn the compressor “ON” or “OFF” as deter-
mined by a signal detected by ambient sensor.
When ambient temperatures are greater than −2°C (28°F), the
compressor turns “ON”. The compressor turns “OFF” when ambi-
ent temperatures are less than −5°C (23°F).
SHA621F
DIAGNOSTIC PROCEDURE
NHHA0203
SYMPTOM: Magnet clutch does not engage when AUTO
switch is ON.
1
CHECK POWER SUPPLY FOR COMPRESSOR
Disconnect compressor harness connector. Do approx. 12 volts exist between compressor harness connector A3 terminal
No. 1 and ground?
RHA096GE
Yes or No
Yes
©
Check magnet clutch coil.
1. If NG, replace magnet clutch. Refer to HA-112.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-4.
Confirm that magnet clutch operation is normal.
No
©
Disconnect A/C relay. And GO TO 2.
TROUBLE DIAGNOSES
Magnet Clutch (Cont’d)
HA-76
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