Nissan Juke F15. Manual - part 859

B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR

HAC-71

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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HAC

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B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR

DTC Logic

INFOID:0000000012200058

DTC DETECTION LOGIC 

NOTE:

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

HAC-

53, "DTC Logic"

.

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

HAC-54,

"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 ignition switch ON.

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

3. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-71, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000012200059

1.

CHECK AIR MIX DOOR MOTOR POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect air mix door motor connector.

3. Turn ignition switch ON.

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

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector between air mix door motor and fuse.

2.

CHECK AIR MIX DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

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

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B27A2

DR AIR MIX DOOR MOT

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

Air mix door motor

Connector

Terminal

M55

2

Ground

Battery voltage

HAC-72

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK AIR MIX DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT

Check continuity between air mix 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 AIR MIX DOOR MOTOR

Check air mix door motor. Refer to 

HAC-72, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-93, "Removal and Installation"

.

NO

>> Replace air mix door motor. Refer to 

HAC-102, "AIR MIX DOOR MOTOR : Removal and Installa-

tion"

.

Component Inspection

INFOID:0000000012200060

1.

CHECK AIR MIX DOOR MOTOR

1. Remove air mix door motor. Refer to 

HAC-102, "AIR MIX DOOR MOTOR : Removal and Installation"

.

2. Check resistance between air mix door motor terminals. Refer to applicable table for the normal value. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace air mix door motor. Refer to 

HAC-102, "AIR MIX DOOR MOTOR : Removal and Installa-

tion"

.

Air mix door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M55

3

M50

17

Existed

6

18

1

19

4

20

Air mix door motor

—

Continuity

Connector

Terminal

M55

3

Ground

Not existed

6

1

4

Terminal

Resistance (

Ω)

(Approx.)

2

1

90

3

4

6

B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

HAC-73

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

DTC Logic

INFOID:0000000012200061

DTC DETECTION LOGIC 

NOTE:

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

HAC-

53, "DTC Logic"

.

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

HAC-54,

"DTC Logic"

.

• If mode door motors DTC (B27A6 – B27A9) are detected, there is probably a disconnected connector or an

open circuit in mode door motor drive power supply harness.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.

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

3. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-73, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000012200062

1.

CHECK MODE DOOR MOTOR POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect mode door motor connector.

3. Turn ignition switch ON.

4. Check voltage between mode door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector between mode door motor and fuse.

2.

CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

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

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B27A6

MODE DOOR MOTOR

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

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

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

B27A7

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

B27A8

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

B27A9

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

+

−

Voltage

Mode door motor

Connector

Terminal

M342

5

Ground

Battery voltage

HAC-74

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT

Check continuity between mode 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 MODE DOOR MOTOR

Check mode door motor. Refer to 

HAC-74, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-93, "Removal and Installation"

.

NO

>> Replace mode door motor. Refer to 

HAC-101, "MODE DOOR MOTOR : Removal and Installa-

tion"

.

Component Inspection

INFOID:0000000012200063

1.

CHECK MODE DOOR MOTOR

1. Remove mode door motor. Refer to 

HAC-101, "MODE DOOR MOTOR : Removal and Installation"

.

2. Check resistance between mode door motor terminals. Refer to applicable table for the normal value. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace mode door motor. Refer to 

HAC-101, "MODE DOOR MOTOR : Removal and Installa-

tion"

.

Mode door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M342

4

M50

37

Existed

3

38

2

39

1

40

Mode door motor

—

Continuity

Connector

Terminal

M342

4

Ground

Not existed

3

2

1

Terminal

Resistance (

Ω)

(Approx.)

5

1

90

2

3

4