Nissan Pathfinder (2012 year). Manual - part 420

HAC-82

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

IN-VEHICLE SENSOR

IN-VEHICLE SENSOR

Component Description

INFOID:0000000007356388

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 A/C auto amp.

In-Vehicle Sensor Diagnosis Procedure

INFOID:0000000007356389

Regarding Wiring Diagram information, refer to 

HAC-95, "Wiring Diagram - Automatic"

.

DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR

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

CONSULT, DTC B2578 or B2579 is displayed. Without a CONSULT,

code 30, 31, 44 or 46 is indicated on A/C auto amp. as a result of

conducting self-diagnosis.

1.

CHECK IN-VEHICLE SENSOR CIRCUIT

Is self-diagnosis DTC B2578 or B2579 (with CONSULT) or code 30, 31 44 or 46 (without CONSULT) present?
YES or NO?

YES

>> GO TO 6.

NO

>> GO TO 2.

2.

CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND

AWIIA0264ZZ

AWIIA0265ZZ

AWIIA0166GB

August 2012

2012 Pathfinder

IN-VEHICLE SENSOR

HAC-83

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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1. Disconnect in-vehicle sensor connector.

2. Turn ignition switch ON.

3. Check voltage between in-vehicle sensor harness connector

M32 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

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

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector M49.

3. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 1 and A/C auto amp. harness connector M50

(A) terminal 32.

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-84, "In-Vehicle Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> 1. Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

2. Go to 

HAC-24, "A/C Auto Amp. Self-Diagnosis"

 and perform self-diagnosis.

NO

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

VTL-9, "Removal and Installation"

.

2. Go to 

HAC-24, "A/C Auto Amp. Self-Diagnosis"

 and perform self-diagnosis.

5.

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

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 4 and A/C auto amp. harness connector M49

(A) terminal 26.

4. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 4 and ground.

Is the inspection result normal?

YES

>> 1. Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

2. Go to 

HAC-24, "A/C Auto Amp. Self-Diagnosis"

 and perform self-diagnosis.

NO

>> Repair harness or connector.

6.

CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR MOTOR AND A/C AUTO AMP. (SELF-

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

1 - Ground

: Approx. 5V.

AWIIA0266ZZ

1 - 32

: Continuity should exist.

AWIIA0267ZZ

4 - 26

: Continuity should exist.

4 - Ground

Continuity should not exist.

AWIIA0268ZZ

August 2012

2012 Pathfinder

HAC-84

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

IN-VEHICLE SENSOR

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector and in-vehicle sensor con-

nector.

3. Check continuity between in-vehicle sensor harness connector

M32 (B) terminal 3 and A/C auto amp. 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 A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

2. Go to 

HAC-24, "A/C Auto Amp. Self-Diagnosis"

 and perform self-diagnosis.

NO

>> Repair harness or connector.

In-Vehicle Sensor Component Inspection

INFOID:0000000007356390

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.

AWIIA0168ZZ

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

AWIIA0269ZZ

August 2012

2012 Pathfinder

OPTICAL SENSOR

HAC-85

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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OPTICAL SENSOR

Component Description

INFOID:0000000007356391

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 A/C auto amp.

OPTICAL INPUT PROCESS

The A/C auto amp. 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:0000000007356392

Regarding Wiring Diagram information, refer to 

HAC-95, "Wiring Diagram - Automatic"

.

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 A/C auto amp. as a result of conducting

self-diagnosis.

1.

CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND A/C AUTO AMP.

AWIIA0169ZZ

AWIIA1067GB

August 2012

2012 Pathfinder

HAC-86

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

OPTICAL SENSOR

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector and optical sensor connec-

tor.

3. Check continuity between optical sensor harness connector

M145 (B) terminals 1 and 2 and A/C auto amp. harness connec-

tor M50 (C) terminal 42 and M49 (A) terminal 1.

4. Check continuity between optical sensor harness connector

M145 (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

M145 (B) terminal 3 and BCM harness connector M18 (A) termi-

nal 18.

3. Check continuity between optical sensor harness connector

M145 (B) terminal 3 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 - 42

: Continuity should exist.

1, 2 - Ground.

: Continuity should not exist.

AWIIA1072ZZ

3 - 18

: Continuity should exist.

3 - Ground

: Continuity should not exist.

AWIIA1068ZZ

August 2012

2012 Pathfinder

INTAKE SENSOR

HAC-87

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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INTAKE SENSOR

System Description

INFOID:0000000007356393

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 A/C auto amp.

Intake Sensor Diagnosis Procedure

INFOID:0000000007356394

Regarding Wiring Diagram information, refer to 

HAC-95, "Wiring Diagram - Automatic"

.

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 A/C auto amp. 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 A/C AUTO AMP.

WJIA1155E

AWIIA0208GB

2 - Ground

: Approx. 5V

WJIA1375E

August 2012

2012 Pathfinder

HAC-88

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE SENSOR

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between intake sensor harness connector

M146 (B) terminal 1 and A/C auto amp. harness connector M49

(A) terminal 26.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK INTAKE SENSOR

Check intake sensor. Refer to 

HAC-88, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> 1. Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

2. Go to 

HAC-24, "A/C Auto Amp. Self-Diagnosis"

 and perform self-diagnosis.

NO

>> 1. Replace intake sensor. Refer to 

VTL-11, "Removal and Installation"

.

2. Go to 

HAC-24, "A/C Auto Amp. Self-Diagnosis"

 and perform self-diagnosis.

4.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND A/C AUTO AMP.

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between intake sensor harness connector

M146 (B) terminal 2 and A/C auto amp. harness connector M49

(A) terminal 11.

4. Check continuity between intake sensor harness connector

M146 (B) terminal 2 and ground.

Is the inspection result normal?

YES

>> 1. Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

2. Go to 

HAC-24, "A/C Auto Amp. Self-Diagnosis"

 and perform self-diagnosis.

NO

>> Repair harness or connector.

Intake Sensor Component Inspection

INFOID:0000000007356395

COMPONENT INSPECTION

Intake Sensor

1 - 26

: Continuity should exist.

AWIIA0209ZZ

2 - 11

: Continuity should exist.

2 - Ground

: Continuity should not exist.

AWIIA0216ZZ

August 2012

2012 Pathfinder

INTAKE SENSOR

HAC-89

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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After disconnecting intake sensor connector, measure resistance

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

below.

If NG, replace intake sensor. Refer to 

VTL-11, "Removal and Installa-

tion"

.

Temperature 

°

C (

°

F)

Resistance k

Ω

−

15 (5)

209.0

−

10 (14)

160.0

−

5 (23)

123.0

0 (32)

95.8

5 (41)

74.9

10 (50)

58.9

15 (59)

46.7

20 (68)

37.3

25 (77)

30.0

30 (86)

24.2

35 (95)

19.7

40 (104)

16.1

45 (113)

13.2

WJIA1159E

August 2012

2012 Pathfinder