Nissan Titan. Manual - part 389

IN-VEHICLE SENSOR

HAC-61

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1. Turn ignition switch OFF.

2. Disconnect front air control connector and in-vehicle sensor con-

nector.

3. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 3 and front air control harness connector M50

(A) terminal 31. 

4. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 3 and ground.

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

2. Go to 

HAC-21, "Front Air Control Self-Diagnosis"

 and perform self-diagnosis.

NO

>> Repair harness or connector.

In-Vehicle Sensor Component Inspection

INFOID:0000000009882476

COMPONENT INSPECTION

In-vehicle Sensor

After disconnecting in-vehicle sensor connector M32, measure resis-

tance between terminals 1 and 4 at sensor component side, using

the table below.

If NG, replace in-vehicle sensor. Refer to 

VTL-9, "Removal and

Installation"

.

3 - 31

: Continuity should exist.

2 - Ground

: Continuity should exist.

3 - Ground

: Continuity should not exist.

AWIIA0429ZZ

Temperature 

°C (°F)

Resistance k

Ω

−15 (5)

21.40

−10 (14)

16.15

−5 (23)

12.29

0 (32)

9.41

5 (41)

7.27

10 (50)

5.66

15 (59)

4.45

20 (68)

3.51

25 (77)

2.79

30 (86)

2.24

35 (95)

1.80

40 (104)

1.45

45 (113)

1.18

AWIIA0430ZZ

HAC-62

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

OPTICAL SENSOR

OPTICAL SENSOR

Component Description

INFOID:0000000009882477

COMPONENT DESCRIPTION

The optical sensor (1) is located in the center of the 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 front air control.

OPTICAL INPUT PROCESS

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

period of time. This prevents adjustments in the ATC 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 optical 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 ATC 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 accord-

ingly.

Optical Sensor Diagnosis Procedure

INFOID:0000000009882478

Regarding Wiring Diagram information, refer to 

HAC-71, "Wiring Diagram - Automatic Air Conditioner"

.

DIAGNOSTIC PROCEDURE FOR OPTICAL SENSOR

SYMPTOM: Optical sensor circuit is open or shorted. Using the

CONSULT, DTC B257F or B2580 is displayed. Without a CONSULT,

code 50 or 52 is indicated on front air control as a result of conduct-

ing self-diagnosis.

1.

CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL

AWIIA0169ZZ

AWIIA1076GB

OPTICAL SENSOR

HAC-63

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1. Turn ignition switch OFF.

2. Disconnect front air control connector and optical sensor con-

nector.

3. Check continuity between optical sensor harness connector

M302 (B) terminals 1 and 2 and front air control harness con-

nector M50 (C) terminal 38 and M49 (A) terminal 1.

4. Check continuity between optical sensor harness connector

M302 (B) terminal 1 and 2 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND BCM

1. Disconnect BCM connector.

2. Check continuity between optical sensor harness connector

M302 (B) terminal 3 and BCM harness connector M18 (A) termi-

nal 18.

3. Check continuity between optical sensor harness connector

M302 (B) terminal 4 and ground.

Is the inspection result normal?

YES

>> Replace optical sensor. Refer to 

VTL-10, "Removal and Installation"

.

NO

>> Repair harness or connector.

1 - 1

: Continuity should exist.

2 - 38

: Continuity should exist.

1, 2 - Ground

: Continuity should not exist.

AWIIA1077ZZ

3 - 18

: Continuity should exist.

3 - Ground

: Continuity should not exist.

AWIIA1078ZZ

HAC-64

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE SENSOR

INTAKE SENSOR

System Description

INFOID:0000000009882479

COMPONENT DESCRIPTION

Intake Sensor

The intake sensor is located on the heater & cooling unit assembly. It

converts temperature of air after if passes through the evaporator

into a resistance value which is then input to the front air control.

Intake Sensor Diagnosis Procedure

INFOID:0000000009882480

Regarding Wiring Diagram information, refer to 

HAC-71, "Wiring Diagram - Automatic Air Conditioner"

.

DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR

SYMPTOM: Intake sensor circuit is open or shorted. Using the CON-

SULT, DTC B2581 or B2582 is displayed. Without a CONSULT, code

56 or 57 is indicated on front air control as a result of conducting self-

diagnosis.

1.

CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND

1. Disconnect intake sensor connector.

2. Turn ignition switch ON.

3. Check voltage between intake sensor harness connector M146

terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

WJIA0571E

AWIIA0433GB

2 - Ground

: Approx. 5V

WJIA1375E