Nissan Frontier. Manual - part 874

HAC-50

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AMBIENT SENSOR

If NG, replace ambient sensor. Refer to 

HA-35, "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

IN-VEHICLE SENSOR

HAC-51

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

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IN-VEHICLE SENSOR

Component Description

INFOID:0000000009478295

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:0000000009478296

Regarding Wiring Diagram information, refer to 

HAC-63, "Wiring Diagram - Automatic Air Conditioner"

.

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 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) or code 30, 31 (without CONSULT) present?
YES or NO?

YES

>> GO TO 6.

NO

>> GO TO 2.

2.

CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND

1. Disconnect in-vehicle sensor connector.

2. Turn 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 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 M52.

3. Check continuity between in-vehicle sensor harness connector M34 terminal 4 and front air control har-

ness connector M52 terminal 26.

AWIIA0165ZZ

AWIIA0426GB

1 - Ground

: Approx. 5V.

HAC-52

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

IN-VEHICLE SENSOR

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-52, "In-Vehicle Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

2. Go to 

HAC-20, "Front Air Control Self-Diagnosis"

 and perform self-diagnosis.

NO

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

VTL-8, "Removal and Installation"

.

2. Go to 

HAC-20, "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 M34 terminal 1 and front air control har-

ness connector M56 terminal 32.

4. Check continuity between in-vehicle sensor harness connector M34 terminal 1 and ground.

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

2. Go to 

HAC-20, "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 OR DTC B2578, B2579)
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

M34 (B) terminal 3 and front air control harness connector M56

(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-7, "Removal and Installation"

.

2. Go to 

HAC-20, "Front Air Control Self-Diagnosis"

 and perform self-diagnosis.

NO

>> Repair harness or connector.

In-Vehicle Sensor Component Inspection

INFOID:0000000009478297

COMPONENT INSPECTION

In-vehicle Sensor

After disconnecting in-vehicle sensor connector M34, measure resistance between terminals 1 and 4 at sen-

sor component side, using the table below.

4 - 26

: Continuity should exist.

1 - 32

: Continuity should exist.

1 - Ground

Continuity should not exist.

3 - 31

: Continuity should exist.

2 - Ground

: Continuity should exist.

3 - Ground

: Continuity should not exist.

AWIIA0429ZZ

IN-VEHICLE SENSOR

HAC-53

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

If NG, replace in-vehicle sensor. Refer to 

VTL-8, "Removal and Installation"

.

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