Infiniti G20 (P11). Manual — part 435
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9
CHECK CIRCUIT CONTINUITY BETWEEN AUTO AMP. AND BLOWER MOTOR
Check circuit continuity between auto amp. harness terminal No. 33 and blower motor harness terminal No. 1.
Continuity should exist.
RHA058H
If OK, check harness for short.
OK or NG
OK
©
Replace auto amp.
NG
©
Repair harness or connector.
10
CHECK POWER SUPPLY FOR BLOWER MOTOR
Disconnect blower motor connector connector.
Do approx. 12 volts exist between blower motor harness terminal No. 1 and body ground?
RHA091GB
Yes or No
Yes
©
GO TO 11.
No
©
1. Check power supply circuit and 15A fuses (Nos. 1 and 2, located in the fuse block).
Refer to EL-14, “Wiring Diagram — POWER —”.
2. If OK, check for open circuit in wiring harness.
Repair or replace as necessary.
3. If NG, Replace fuse and check wiring harness for short circuit.
Repair or replace as necessary.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Blower Motor (Cont’d)
HA-71
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11
CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND FAN CONTROL AMP.
Check circuit continuity between blower motor harness terminal No. 2 and fan control amp. harness terminal No. 3.
Continuity should exist.
RHA472GA
If OK, check harness for short.
OK or NG
OK
©
GO TO 12.
NG
©
Repair harness or connector.
12
CHECK BLOWER MOTOR
Refer to “COMPONENT INSPECTION” (HA-72).
NG
©
Replace blower motor.
RHA059H
COMPONENT INSPECTION
NCHA0065
Blower Motor
NCHA0065S01
Confirm smooth rotation of the blower motor.
I
Ensure that there are no foreign particles inside the intake unit.
RHA828HB
Fan Control Amp.
NCHA0065S02
Check continuity between terminals.
Terminal Nos.
Continuity
1 - 2
Yes
TROUBLE DIAGNOSES
AUTO
Blower Motor (Cont’d)
HA-72
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Magnet Clutch
TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH
=NCHA0095
SYMPTOM:
I
Magnet clutch does not engage.
INSPECTION FLOW
SHA177F
*1: STEP-BY-STEP PROCEDURE
*2: HA-92
*3: HA-95
*4: HA-99
*5: HA-104
*6: STEP-BY-STEP PROCEDURE
(HA-32), see No. 12.
*11: STEP-BY-STEP PROCEDURE
(HA-32), see No. 5, 8.
*12: HA-42
*13: HA-41
*14: HA-102
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Magnet Clutch
HA-73
![](/vehicles/zatt/wheiso/zix/ked.png)
RHA094GA
SYSTEM DESCRIPTION
=NCHA0066
Auto amplifier controls compressor operation by ambient tempera-
ture and signal from ECM.
Low Temperature Protection Control
NCHA0066S01
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 1°C (34°F), the com-
pressor turns “ON”. The compressor turns “OFF” when ambient
temperatures are less than −2°C (28°F).
DIAGNOSTIC PROCEDURE
NCHA0067
SYMPTOM: Magnet clutch does not engage when AUTO
switch is ON.
RHA525H
1
CHECK POWER SUPPLY FOR COMPRESSOR
Disconnect compressor harness connector. Do approx. 12 volts exist between compressor harness terminal No. 1 and
body ground?
RHA096GB
Yes or No
Yes
©
Check magnet clutch coil.
1. If NG, replace magnet clutch. Refer to HA-111.
2. Go to self-diagnosis step-by-step procedure (HA-32) and perform self-diagnosis
STEP-4.
Confirm that magnet clutch operation is normal.
No
©
Disconnect A/C relay. And GO TO 2.
TROUBLE DIAGNOSES
AUTO
Magnet Clutch (Cont’d)
HA-74
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