Infiniti FX35, FX50 (S51). Manual - part 1174

IN-VEHICLE SENSOR

HAC-93

< DTC/CIRCUIT 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

>> INSPECTION END

NO

>> Replace in-vehicle 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

HAC-94

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

SUNLOAD SENSOR

SUNLOAD SENSOR

Description

INFOID:0000000005246283

COMPONENT DESCRIPTION

Sunload Sensor

The sunload sensor (1) is located on the driver’s side front defroster
grille. It detects sunload entering through windshield by means of a
photo diode. The sensor converts the sunload into a current value
which is then input into the unified meter and A/C amp.

SUNLOAD INPUT PROCESS

The unified meter and A/C amp. also equips a processing circuit which averages the variations in detected
sunload over a period of time. This prevents drastic swings in the air temperature control system operation
due to small or quick variations in detected sunload.
For example, consider driving along a road bordered by an occasional group of large trees. The sunload
detected by the sunload sensor varies whenever the trees obstruct the sunlight. The processing circuit aver-
ages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the air temperature control system operation. On the
other hand, shortly after entering a long tunnel, the system recognizes the change in sunload, and the system
reacts accordingly.

Component Function Check

INFOID:0000000005246284

1.

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis function STEP-2. Refer to 

HAC-57, "WITHOUT ACCS : Diagnosis Description"

 (WITH-

OUT ACCS) or 

HAC-62, "WITH ACCS : Diagnosis Description"

 (WITH ACCS.

25 or 

−

25 is displayed.

YES

>> Go to Diagnosis Procedure. Refer to 

HAC-94, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005246285

1.

CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND

1.

Disconnect sunload sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between sunload sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

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

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

JPIIA0647ZZ

(+)

(

−

)

Voltage

Sunload sensor

—

Connector

Terminal

M46

1

Ground

Approx. 5 V

SUNLOAD SENSOR

HAC-95

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

3.

Check continuity between sunload 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 SUNLOAD SENSOR

1.

Reconnect sunload sensor connector and unified meter and A/C amp. connector.

2.

Check sunload sensor. Refer to 

HAC-95, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Replace sunload sensor.

4.

CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD 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 sunload sensor harness connector and unified meter and A/C amp. harness
connector.

4.

Check continuity between sunload 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:0000000005246286

1.

CHECK SUNLOAD SENSOR

1.

Turn ignition switch ON.

2.

Check voltage between unified meter and A/C amp. harness connector and ground.

Sunload sensor

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

M46

2

M67

62

Existed

Sunload sensor

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

M46

1

M67

46

Existed

Sunload sensor

—

Continuity

Connector

Terminal

M46

1

Ground

Not existed

(+)

(

−

)

Unified meter and A/C amp.

—

Connector

Terminal

M67

46

Ground

HAC-96

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

SUNLOAD SENSOR

NOTE:
Select a place where sunshine directly on it when checking sunload sensor.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace sunload sensor.

SHA930E