Nissan Sentra. Manual - part 558

HAC-80

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

B27A0, B27A1 INTAKE DOOR MOTOR

YES

>> GO TO 3.

NO

>> GO TO 7.

3.

CHECK INTAKE DOOR MOTOR PBR GROUND CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK INTAKE DOOR MOTOR PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN

Check continuity between intake door motor 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 INTAKE DOOR MOTOR PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT

Check continuity between intake door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK INTAKE DOOR MOTOR PBR

Check intake door motor PBR. Refer to 

HAC-81, "Component Inspection (PBR)"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-105, "Removal and Installation"

.

NO

>> Replace intake door motor. Refer to 

HAC-112, "INTAKE DOOR MOTOR : Removal and Installa-

tion"

.

7.

CHECK INTAKE DOOR MOTOR PBR POWER SUPPLY CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-105, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M58

3

M34

10

Yes

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M58

2

M34

22

Yes

Intake door motor

—

Continuity

Connector

Terminal

M58

2

Ground

No

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M58

1

M34

8

Yes

B27A0, B27A1 INTAKE DOOR MOTOR

HAC-81

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

8.

CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect intake door motor connector, and A/C auto amp. connector.

3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair harness or connector.

9.

CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT

Check continuity between intake door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair harness or connector.

10.

CHECK INTAKE DOOR MOTOR 

1. Turn ignition switch OFF.

2. Check intake door motor. Refer to 

HAC-82, "Component Inspection (Motor)"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace intake door motor. Refer to 

HAC-112, "INTAKE DOOR MOTOR : Removal and Installa-

tion"

.

11.

CHECK INSTALLATION OF INTAKE DOOR MOTOR SYSTEM

Check intake door motor system is properly installed. Refer to 

HAC-111, "Exploded View"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-105, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning parts.

Component Inspection (PBR)

INFOID:0000000009757677

1.

CHECK INTAKE DOOR MOTOR PBR

Check resistance between intake door motor terminals.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace intake door motor. Refer to 

HAC-112, "INTAKE DOOR MOTOR : Removal and Installa-

tion"

.

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M58

5

M34

35

Yes

6

36

Intake door motor

—

Continuity

Connector

Terminal

M58

5

Ground

No

6

Terminal

Resistance (

Ω)

1

2

Except 0 or 

∞

3

HAC-82

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

B27A0, B27A1 INTAKE DOOR MOTOR

Component Inspection (Motor)

INFOID:0000000009757678

1.

CHECK INTAKE DOOR MOTOR

Supply intake door motor terminals with battery voltage and check by visually and operation sound that intake

door motor operates.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace intake door motor. Refer to 

HAC-112, "INTAKE DOOR MOTOR : Removal and Installa-

tion"

.

Terminal

Operation direction

+

−

5

6

FRE

6

5

REC

POWER SUPPLY AND GROUND CIRCUIT

HAC-83

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

POWER SUPPLY AND GROUND CIRCUIT

A/C AUTO AMP.
A/C AUTO AMP. : Diagnosis Procedure

INFOID:0000000009757679

Regarding Wiring Diagram information, refer to 

HAC-41, "Wiring Diagram"

.

1.

CHECK FUSE

Check fuses [No. 5, 8 and 21, located in the fuse block (J/B)].

NOTE:

Refer to 

PG-47, "Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit.

2.

CHECK A/C AUTO AMP. POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector. 

3. Check voltage between A/C auto amp. harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector between A/C auto amp. and fuse block (J/B).

3.

CHECK A/C AUTO AMP. GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between A/C auto amp. harness connector and ground. 

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair harness or connector.

A/C SWITCH ASSEMBLY
A/C SWITCH ASSEMBLY : Component Function Check

INFOID:0000000009757680

1.

CHECK OPERATION

1. Press the AUTO switch, and then check that “AUTO” is shown on the display. 

2. Operate the temperature control switch (driver side). Check that the fan speed or outlet changes. (The

discharge air temperature or fan speed varies depending on the ambient temperature, in-vehicle tempera-

ture, and temperature setting.) 

Does it operate normally?

YES

>> Inspection End.

+

−

Voltage

A/C auto amp.

Ignition switch position

Connector

Terminal

OFF

ACC

ON

M34

11

Ground

Approx. 0 V

Approx. 0 V

Battery voltage

12

Battery voltage

Battery voltage

Battery voltage

21

Approx. 0 V

Battery voltage

Battery voltage

A/C auto amp.

—

Continuity

Connector

Terminal

M34

30

Ground

Yes