Nissan Altima L32. Manual - part 820

HAC-54

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

IN-VEHICLE SENSOR

1.

CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR HARNESS CONNECTOR AND BODY GROUND

1. Disconnect in-vehicle sensor connector M34.

2. Press ignition switch ON.

3. Check voltage between in-vehicle sensor harness connector

M34 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> GO TO 4

2.

CHECK IN-VEHICLE SENSOR GROUND CIRCUIT BETWEEN IN-VEHICLE SENSOR AND FRONT AIR

CONTROL
1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control harness connector

M37 (A) terminal 26 and in-vehicle sensor harness connector

M34 (B) terminal 2.

If OK, check harness for short.
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-55, "Component Inspection"

.

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

2. Confirm system operation.

NO

>> 1. Replace in-vehicle sensor. Refer to 

VTL-9, "Removal and Installation"

.

2. Confirm system operation.

4.

CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control harness connector

M37 (A) terminal 27 and in-vehicle sensor harness connector

M34 (B) terminal 1.

If OK, check harness for short.
Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

2. Confirm system operation.

NO

>> Repair harness or connector.

Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

5V

M34 - 1 

WJIA0082E

Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

M37 - 26

M34 - 2

AWIIA0628ZZ

Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

M37 - 27

M34 - 1

AWIIA0629ZZ

IN-VEHICLE SENSOR

HAC-55

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Component Inspection

INFOID:0000000004498220

In-vehicle Sensor

After disconnecting in-vehicle sensor connector M34, measure resis-

tance between terminals 1 and 2 at sensor side, using the table

below.

If NG, replace in-vehicle sensor. Refer to 

VTL-9, "Removal and

Installation"

.

Temperature 

°C (°F)

Resistance k

Ω

−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

RJIA4097E

HAC-56

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

SUNLOAD SENSOR

SUNLOAD SENSOR

Description

INFOID:0000000004498221

COMPONENT DESCRIPTION

The sunload sensor (1) is located on the LH tweeter 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 front air control.

SUNLOAD INPUT PROCESS

The front air control also includes a processing circuit which averages the variations in detected sunload over

a period of time. This prevents drastic swings in the automatic 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 will vary 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 automatic temperature control system operation.

On the other hand, shortly after entering a long tunnel, the system will recognize the change in sunload, and

the system will react accordingly.

Diagnosis Procedure

INFOID:0000000004498222

DIAGNOSTIC PROCEDURE

SYMPTOM: Sunload sensor circuit is open or shorted.

1.

CHECK VOLTAGE BETWEEN SUNLOAD SENSOR HARNESS CONNECTOR AND BODY GROUND

1. Disconnect sunload sensor connector.

2. Press ignition switch ON.

3. Check voltage between sunload sensor harness connector M56

terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> GO TO 4

AWIIA0033ZZ

AWIIA0034GB

Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

5V

M56 - 1

RJIA0254E

SUNLOAD SENSOR

HAC-57

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

2.

CHECK SUNLOAD SENSOR GROUND CIRCUIT BETWEEN SUNLOAD SENSOR AND FRONT AIR

CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control connector M37 (A)

terminal 26 and sunload sensor harness connector M56 (B) ter-

minal 2.

If OK, check harness for short.
Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair harness or connector.

3.

CHECK SUNLOAD SENSOR

Check sunload sensor. Refer to 

HAC-57, "Component Inspection"

.

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

2. Confirm system operation.

NO

>> 1. Replace sunload sensor. Refer to 

VTL-10, "Removal and Installation"

.

2. Confirm system operation.

4.

CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control connector M37 (A)

terminal 7 and sunload sensor harness connector M56 (B) ter-

minal 1.

If OK, check harness for short.
Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

2. Confirm system operation.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000004498223

Sunload Sensor

Measure voltage between front air control harness connector M37 terminal 7 and ground.

If NG, replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

M37 - 26

M56-2

AWIIA0630ZZ

Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

M37 - 7

M56 - 1

AWIIA0631ZZ