Infiniti FX35 / FX45. Manual - part 118

ATC-68

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

2.

Check continuity between blower motor harness connector M78
terminal 2 and unified meter and A/C amp. harness connector
M57 terminal 53.

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness or connector.

4.

CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL

1.

Reconnect blower motor connector and unified meter and A/C amp. connector.

2.

Turn ignition switch ON.

3.

Change the fan speed from Lo to Hi, and check the duty ratios
between blower motor harness connector M78 terminal 2 and
ground using an oscilloscope. Normal terminal 2 drive signal
duty ratios are shown in the table below.

OK or NG

OK

>> Replace blower motor after confirming the fan air flow does not change.

NG

>> Replace unified meter and A/C amp.

COMPONENT INSPECTION

Blower Motor

2 – 53

: Continuity should exist.

RJIA1999E

RJIA2000E

SJIA1802E

TROUBLE DIAGNOSIS

ATC-69

< SERVICE INFORMATION >

C

D

E

F

G

H

I

K

L

M

A

B

ATC

N

O

P

Confirm smooth rotation of the blower motor.
• Ensure that there are no foreign particles inside the blower unit.

Magnet Clutch Circuit

INFOID:0000000001328190

SYMPTOM: Magnet clutch does not engage.

INSPECTION FLOW

RJIA0905E

*1

ATC-94, "Intake Sensor Circuit"

*2

ATC-86, "Ambient Sensor Circuit"

*3

ATC-43, "Self-Diagnosis Function"

, 

see No. 13.

SJIA1590E

ATC-70

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION

Unified meter and A/C amp. controls compressor operation by ambient temperature, intake air temperature
and signal from ECM.

Low Temperature Protection Control

Unified meter and A/C amp. will turn the compressor ON or OFF as determined by a signal detected by ambi-
ent sensor and intake sensor.
When ambient temperature is higher than 

−

2

°

C (28

°

F), the compres-

sor turns ON. The compressor turns OFF when ambient temperature
is lower than 

−

5

°

C (23

°

F).

When intake air temperature is higher than 1

°

C (34

°

F), the compres-

sor turns ON. The compressor turns OFF when intake air tempera-
ture is lower than 

−

5

°

C (23

°

F).

DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

1.

CHECK AMBIENT SENSOR AND INTAKE SENSOR CIRCUIT

Check ambient sensor and intake sensor. Refer to 

ATC-43, "Self-Diagnosis Function"

, see No. 9 and 11.

*4

"DIAGNOSIS PROCEDURE FOR 
MAGNET CLUTCH"

*5

ATC-75, "Insufficient Cooling"

*6

ATC-50, "Operational Check"

*7

ATC-43, "Self-Diagnosis Function"

, 

see No. 4 to 6.

*8

ATC-32, "How to Perform Trouble Di-
agnosis for Quick and Accurate Re-
pair"

RHA094GB

SJIA0267E

SJIA1608E

TROUBLE DIAGNOSIS

ATC-71

< SERVICE INFORMATION >

C

D

E

F

G

H

I

K

L

M

A

B

ATC

N

O

P

OK or NG

OK

>> GO TO 2.

NG

>> • Malfunctioning ambient sensor: Refer to 

ATC-86, "Ambient Sensor Circuit"

.

• Malfunctioning intake sensor: Refer to 

ATC-94, "Intake Sensor Circuit"

.

2.

PERFORM IPDM E/R AUTO ACTIVE TEST

Perform “IPDM E/R auto active test”. Refer to 

PG-20, "Auto Active Test"

.

Does the magnet clutch operate?

YES

>> •

WITH CONSULT-III: GO TO 5

•

WITHOUT CONSULT-III: GO TO 6.

NO

>> Check 10A fuse (No. 79, located in IPDM E/R). Refer to 

PG-23, "IPDM E/R Terminal Arrange-

ment"

, and GO TO 3.

3.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R connector and compressor connector.

3.

Check continuity between IPDM E/R harness connector E8 ter-
minal 33 and compressor harness connector F2 terminal 1.

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness or connector.

4.

CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage direct cur-
rent to terminal.

OK or NG

OK

>> 1.

Replace IPDM E/R.

2.

Go to self-diagnosis procedure 

ATC-43, "Self-Diag-

nosis Function"

 and perform self-diagnosis STEP-4.

Confirm that magnet clutch operation normal. 

NG

>> 1.

Replace magnet clutch.

2.

Go to self-diagnosis procedure 

ATC-43, "Self-Diag-

nosis Function"

 and perform self-diagnosis STEP-4.

Confirm that magnet clutch operation normal. 

5.

CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal in “Data monitor”. Refer to 

ATC-32, "CONSULT-III Function"

.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 6.

6.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and unified meter and A/C amp. connector.

33 – 1

: Continuity should exist.

RJIA2004E

RJIA2005E

A/C SW ON

: AIR COND SW ON

A/C SW OFF

: AIR COND SW OFF