Infiniti I35 (A33). Manual — part 539
1
CHECK POWER SUPPLY FOR FAN CONTROL AMP.
Disconnect fan control amp. harness connector.
Do approx. 12 volts exist between fan control amp. harness connector M31 terminal No. 1 and ground?
RHA392H
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 8.
2
CHECK GROUND CIRCUIT FOR FAN CONTROL AMP.
Does continuity exist between fan control amp. harness connector M31 terminal No. 3 and ground?
RHA393H
Yes or No
Yes
©
Reconnect fan control amp. harness connector. And GO TO 3.
No
©
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-69
3
CHECK VOLTAGE FOR FAN CONTROL AMP.
Set up Self-diagnosis STEP 4.
Measure voltage across fan control amp. harness connector M31 terminal No. 2 and ground.
RHA786HA
OK or NG
OK
©
GO TO 4.
NG
©
1. If the voltage is less than 2.5V, replace fan control amp.
2. If the voltage is more than 3.0V, GO TO 4.
3. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-4.
Confirm that blower motor operation is normal.
4
CHECK FAN CONTROL AMP.
Refer to HA-74.
OK or NG
OK
©
GO TO 5.
NG
©
1. Replace fan control amp.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-4.
Confirm that blower motor operation is normal.
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-70
5
CHECK FAN CONTROL AMP. CIRCUIT BETWEEN FAN CONTROL AMP. AND AUTO AMP.
1. Disconnect auto amp. and fan control amp. harness connector.
2. Check circuit continuity between auto amp. harness connector M60 terminal No. 35 and fan control amp. harness con-
nector M31 terminal No. 2.
SHA375F
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
GO TO 6.
NG
©
Repair harness or connector.
6
CHECK POWER SUPPLY FOR A/C AUTO AMP.
Reconnect auto amp. harness connector.
Do approx. 12 volts exist between auto amp. harness connector M60 terminal No. 33 and ground?
SHA371F
Yes or No
Yes
©
GO TO 7.
No
©
Check power supply circuit and 15A fuses (Nos. 51 and 52, located in the fuse and fus-
ible link box).
Refer to EL-12, “Wiring Diagram — POWER —”.
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.
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-71
7
CHECK FEEDBACK SIGNAL
Do approx. 12 volts exist between auto amp. harness connector M60 terminal No. 34 and ground?
SHA370F
Yes or No
Yes
©
1. Replace auto amp.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP 4.
Confirm that blower motor operation is normal.
No
©
GO TO 10.
8
CHECK POWER SUPPLY FOR BLOWER MOTOR
Disconnect blower motor harness connector.
Do approx. 12 volts exist between blower motor harness connector E102 terminal No. 1 and ground?
RHA091GE
Yes or No
Yes
©
GO TO 9.
No
©
Check power supply circuit and 15A fuses (Nos. 51 and 52, located in the fuse and
fusible link box).
I
Check blower motor relay.
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.
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-72
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