Infiniti G37 Coupe. Manual - part 775

AMBIENT SENSOR

HAC-89

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

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

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

Check continuity between ambient sensor harness connector and unified meter and A/C amp. harness
connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK AMBIENT SENSOR

Check ambient sensor. Refer to 

HAC-89, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Replace ambient sensor.

4.

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

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

Check continuity between ambient sensor harness connector and unified meter and A/C amp. harness
connector.

4.

Check continuity between ambient sensor harness connector and ground.

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000001675720

1.

CHECK AMBIENT SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect ambient sensor connector. Refer to 

VTL-25, "Exploded View"

.

3.

Check continuity between ambient sensor terminals.

(+)

(

−

)

Voltage

Ambient sensor

—

Connector

Terminal

E76

1

Ground

Approx. 5 V

Ambient sensor

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

E76

2

M67

61

Existed

Ambient sensor

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

E76

1

M67

45

Existed

Ambient sensor

—

Continuity

Connector

Terminal

E76

1

Ground

Not existed

HAC-90

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AMBIENT SENSOR

Is the inspection result normal?

YES

>> END.

NO

>> Replace ambient sensor.

Terminal

Condition

Resistance k

Ω

Temperature 

°

C (

°

F)

1

2

−

15 (5)

12.73

−

10 (14)

9.92

−

5 (23)

7.80

0 (32)

6.19

5 (41)

4.95

10 (50)

3.99

15 (59)

3.24

20 (68)

2.65

25 (77)

2.19

30 (86)

1.81

35 (95)

1.51

40 (104)

1.27

45 (113)

1.07

IN-VEHICLE SENSOR

HAC-91

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

IN-VEHICLE SENSOR

Description

INFOID:0000000001675721

In-vehicle Sensor
The in-vehicle sensor (1) is located on instrument driver lower panel.
It converts variations in compartment air temperature drawn from the
aspirator into a resistance value. It is then input into the unified meter
and A/C amp.

In-vehicle Sensor Circuit

Aspirator
The aspirator (1) is located on driver’s side of heater & cooling unit
assembly. It produces vacuum pressure due to air discharged from
the heater & cooling unit assembly, continuously taking compartment
air in the aspirator.

Component Function Check

INFOID:0000000001675722

1.

PERFORM SELF-DIAGNOSIS STEP-2

JSIIA0048ZZ

RJIA4094E

JSIIA0100ZZ

RJIA1804E

HAC-92

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

IN-VEHICLE SENSOR

Perform self-diagnosis STEP-2. Refer to 

HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (Without left and right ventilation tempera-

ture separately control system) or 

HAC-48, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (With left and right ventilation temperature sepa-

rately control system), see Nos. 1 to 2.
22 or –22 is displayed.

YES

>> Go to Diagnosis Procedure. Refer to 

HAC-92, "Diagnosis Procedure"

.

NO

>> END.

Diagnosis Procedure

INFOID:0000000001675723

1.

CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND

1.

Disconnect in-vehicle sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between in-vehicle sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

Check continuity between in-vehicle sensor harness connector and unified meter and A/C amp. harness
connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK IN-VEHICLE SENSOR

Check in-vehicle sensor. Refer to 

HAC-93, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Replace in-vehicle sensor.

4.

CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

Check continuity between in-vehicle sensor harness connector and unified meter and A/C amp. harness
connector.

4.

Check continuity between in-vehicle sensor harness connector and ground.

(+)

(

−

)

Voltage

In-vehicle sensor

—

Connector

Terminal

M61

1

Ground

Approx. 5 V

In-vehicle sensor

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

M61

2

M67

60

Existed

In-vehicle sensor

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

M61

1

M67

44

Existed