Nissan Sentra. Manual - part 553

HAC-60

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

B2578, B2579 IN-VEHICLE SENSOR

B2578, B2579 IN-VEHICLE SENSOR

DTC Logic

INFOID:0000000009757654

DTC DETECTION LOGIC 

NOTE:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

HAC-

58, "DTC Logic"

.

• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to 

HAC-

59, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.

2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

3. Check if any DTC No. is displayed in the self-diagnosis results. 
Is DTC detected?

YES

>> Refer to 

HAC-60, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009757655

Regarding Wiring Diagram information, refer to 

HAC-41, "Wiring Diagram"

.

1.

CHECK IN-VEHICLE SENSOR POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect in-vehicle sensor connector.

3. Turn ignition switch ON.

4. Check voltage between in-vehicle sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK IN-VEHICLE SENSOR GROUND CIRCUIT 

1. Turn ignition switch OFF.

2. Check continuity between front in-vehicle sensor harness connector and ground.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B2578

IN-VEHICLE SENSOR

The in-vehicle sensor recognition temperature 
is too high.

• In-vehicle sensor
• A/C auto amp.
• Harness or connectors

(The sensor circuit is open or short-
ed.)

B2579

The in-vehicle sensor recognition temperature 
is too low.

+

−

Voltage

(Approx.)

In-vehicle sensor

Connector

Terminal

M69

1

Ground

5 V

B2578, B2579 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

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-61, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-105, "Removal and Installation"

.

NO

>> Replace in-vehicle sensor. Refer to 

HAC-107, "Removal and Installation"

.

4.

CHECK IN-VEHCILE SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between in-vehicle sensor harness connector and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT

Check continuity between in-vehicle sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT

1. Turn ignition switch ON.

2. Check voltage between in-vehicle sensor harness connector and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-105, "Removal and Installation"

.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000009757656

1.

CHECK IN-VEHICLE SENSOR

1. Turn ignition switch OFF.

2. Disconnect in-vehicle sensor connector.

In-vehicle sensor

—

Continuity

Connector

Terminal

M69

2

Ground

Yes

In-vehicle sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M69

1

M34

2

Yes

In-vehicle sensor

—

Continuity

Connector

Terminal

M69

1

Ground

No

+

−

Voltage

(Approx.)

In-vehicle sensor

Connector

Terminal

M69

1

Ground

0 V

HAC-62

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

B2578, B2579 IN-VEHICLE SENSOR

3. Check resistance between in-vehicle sensor terminals.

Is the inspection result normal?

YES

>> Inspection End. 

NO

>> Replace in-vehicle sensor. Refer to 

HAC-107, "Removal and Installation"

.

Terminal

Condition

Resistance: k

Ω

Temperature: 

°C (°F)

1

2

 

−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

B257B, B257C AMBIENT 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

B257B, B257C AMBIENT SENSOR

DTC Logic

INFOID:0000000009757657

DTC DETECTION LOGIC 

NOTE:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

HAC-

58, "DTC Logic"

.

• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to 

HAC-

59, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.

2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

3. Check if any DTC No. is displayed in the self-diagnosis results. 
Is DTC detected?

YES

>> Refer to 

HAC-63, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009757658

Regarding Wiring Diagram information, refer to 

HAC-41, "Wiring Diagram"

.

1.

CHECK AMBIENT SENSOR POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect ambient sensor connector.

3. Turn ignition switch ON.

4. Check voltage between ambient sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK AMBIENT SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between ambient sensor harness connector and ground.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B257B

AMBIENT SENSOR

The ambient sensor recognition temperature is 
too high.

• Ambient sensor
• A/C auto amp.
• Harness or connectors

(The sensor circuit is open or short-
ed.)

B257C

The ambient sensor recognition temperature is 
too low.

+

−

Voltage

(Approx.)

Ambient sensor

Connector

Terminal

E67

1

Ground

5 V