Nissan Titan A60. Manual - part 594

IN-VEHICLE SENSOR

HAC-59

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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IN-VEHICLE SENSOR

Component Description

INFOID:0000000006164711

COMPONENT DESCRIPTION

In-vehicle Sensor

The in-vehicle sensor (1) is located on the lower instrument panel

LH. It converts variations in temperature of passenger compartment

air (drawn in through the integrated fan) into a resistance value. It is

then input into the front air control.

In-Vehicle Sensor Diagnosis Procedure

INFOID:0000000006164712

Regarding Wiring Diagram information, refer to 

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

.

DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR

SYMPTOM: In-vehicle sensor circuit is open or shorted. Using the

CONSULT-III, DTC B2578 or B2579 is displayed. Without a CON-

SULT-III, code 30, 31 is indicated on front air control as a result of

conducting self-diagnosis.

1.

CHECK IN-VEHICLE SENSOR CIRCUIT

Is self-diagnosis DTC B2578 or B2579 (with CONSULT-III) or code 30, 31 (without CONSULT-III) present?
YES or NO?

YES

>> GO TO 6.

NO

>> GO TO 2.

2.

CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND

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HAC-60

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

IN-VEHICLE SENSOR

1. Disconnect in-vehicle sensor connector.

2. Turn ignition switch ON.

3. Check voltage between in-vehicle sensor harness connector

M32 terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

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

1. Turn ignition switch OFF.

2. Disconnect front air control connector M49.

3. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 1 and front air control harness connector M49

(A) terminal 26.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK IN-VEHICLE SENSOR

Check in-vehicle sensor. Refer to 

HAC-61, "In-Vehicle Sensor Component Inspection"

.

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

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

VTL-9, "Removal and Installation"

.

2. Go to 

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

 and perform self-diagnosis.

5.

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

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 4 and front air control harness connector M50

(A) terminal 32.

4. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 4 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.

6.

CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR MOTOR AND FRONT AIR CONTROL

(SELF-DIAGNOSIS CODES 30, 31, 44, 46 OR DTC B2578, B2579)

4 - Ground

: Approx. 5V.

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1 - 26

: Continuity should exist.

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4 - 32

: Continuity should exist.

4 - Ground

Continuity should not exist.

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IN-VEHICLE SENSOR

HAC-61

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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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:0000000006164713

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.

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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:0000000006164714

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:0000000006164715

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-III, DTC B257F or B2580 is displayed. Without a CON-

SULT-III, code 50 or 52 is indicated on front air control as a result of

conducting self-diagnosis.

1.

CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL

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