Nissan Leaf. Manual - part 776

B27A0, B27A1 INTAKE DOOR MOTOR

HAC-107

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

YES

>> GO TO 3.

NO

>> GO TO 7.

3.

CHECK INTAKE DOOR MOTOR PBR GROUND CIRCUIT FOR OPEN

1. Turn power 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-108, "Component Inspection (PBR)"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-187, "Removal and Installation"

.

NO

>> Replace intake door motor. Refer to 

HAC-204, "INTAKE DOOR MOTOR : Removal and Installa-

tion"

.

7.

CHECK INTAKE DOOR MOTOR PBR POWER SUPPLY CIRCUIT FOR OPEN

1. Turn power 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-187, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M54

3

M55

30

Yes

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M54

2

M55

38

Yes

Intake door motor

—

Continuity

Connector

Terminal

M54

2

Ground

No

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M54

1

M55

27

Yes

HAC-108

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27A0, B27A1 INTAKE DOOR MOTOR

8.

CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN

1. Turn power 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 power switch OFF.

2. Check intake door motor. Refer to 

HAC-109, "Component Inspection (Motor)"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace intake door motor. Refer to 

HAC-204, "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-203, "Exploded View"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-187, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning components.

Component Inspection (PBR)

INFOID:0000000010121819

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-204, "INTAKE DOOR MOTOR : Removal and Installa-

tion"

.

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M54

5

M55

21

Yes

6

1

Intake door motor

—

Continuity

Connector

Terminal

M54

5

Ground

No

6

Terminal

Resistance (

Ω)

1

2

Except 0 or 

∞

3

B27A0, B27A1 INTAKE DOOR MOTOR

HAC-109

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Component Inspection (Motor)

INFOID:0000000010121820

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-204, "INTAKE DOOR MOTOR : Removal and Installa-

tion"

.

Terminal

Operation direction

+

−

5

6

REC

6

5

FRE

HAC-110

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR

B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR

DTC Logic

INFOID:0000000010121821

DTC DETECTION LOGIC 

NOTE:

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

HAC-

87, "DTC Logic"

.

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

HAC-88,

"DTC Logic"

.

• If air mix door motors DTC (B27A2 – B27A5) are detected, there is probably a disconnected connector or an

open circuit in air mix door motor drive power supply harness.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn power switch ON.

2. Select “Self Diagnostic Result” of “HVAC” using CONSULT.

3. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-110, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121822

Regarding Wiring Diagram information, refer to 

HAC-61, "Wiring Diagram"

.

1.

CHECK AIR MIX DOOR MOTOR POWER SUPPLY

1. Turn power switch OFF.

2. Disconnect air mix door motor connector.

3. Turn power switch ON.

4. Check voltage between air mix door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK A/C RELAY CIRCUIT

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B27A2

AIR MIX DOOR MOTOR

Short or open circuit of air mix door motor drive 
signal terminal 1.

• Air mix door motor
• A/C auto amp.
• Harness or connectors

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

B27A3

Short or open circuit of air mix door motor drive 
signal terminal 2.

B27A4

Short or open circuit of air mix door motor drive 
signal terminal 3.

B27A5

Short or open circuit of air mix door motor drive 
signal terminal 4.

+

−

Voltage

(Approx.)

Air mix door motor

Connector

Terminal

M146

4

Ground

Battery voltage