Nissan Leaf. Manual - part 830

B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

HAC-323

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

DTC Logic

INFOID:0000000010122033

DTC DETECTION LOGIC 

NOTE:

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

HAC-

278, "DTC Logic"

.

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

HAC-279,

"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 power switch ON.

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

3. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-323, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010122034

Regarding Wiring Diagram information, refer to 

HAC-253, "Wiring Diagram"

.

1.

CHECK MODE DOOR MOTOR POWER SUPPLY

1. Turn power switch OFF.

2. Disconnect mode door motor connector.

3. Turn power switch ON.

4. Check voltage between mode 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

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

(Approx.)

Mode door motor

Connector

Terminal

M142

4

Ground

Battery voltage

HAC-324

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

Check A/C relay circuit. Refer to 

EVC-385, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Repair harness or connector between A/C relay and mode door motor.

NO

>> Repair or replace malfunctioning components.

3.

CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN

1. Turn power 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.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

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 5.

NO

>> Repair harness or connector.

5.

CHECK MODE DOOR MOTOR

Check mode door motor. Refer to 

HAC-324, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-347, "Removal and Installation"

.

NO

>> Replace mode door motor. Refer to 

HAC-363, "MODE DOOR MOTOR : Removal and Installa-

tion"

.

Component Inspection

INFOID:0000000010122035

1.

CHECK MODE DOOR MOTOR

1. Remove mode door motor. Refer to 

HAC-363, "MODE DOOR MOTOR : Removal and Installation"

.

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

Mode door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M142

6

M55

2

Yes

5

3

2

4

1

5

Mode door motor

—

Continuity

Connector

Terminal

M142

6

Ground

No

5

2

1

Terminal

Resistance (

Ω)

(Approx.)

4

1

90

2

5

6

B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

HAC-325

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace mode door motor. Refer to 

HAC-363, "MODE DOOR MOTOR : Removal and Installa-

tion"

.

HAC-326

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

B27C2, B27C3 PTC HEATER OUTLET AIR TEMPERATURE SENSOR

B27C2, B27C3 PTC HEATER OUTLET AIR TEMPERATURE SENSOR

DTC Logic

INFOID:0000000010122036

DTC DETECTION LOGIC 

NOTE:

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

HAC-

278, "DTC Logic"

.

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

HAC-279,

"DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn power switch OFF.

2. Set the vehicle to READY.

3. Operate the automatic air conditioning system.

4. Set the temperature to full hot and wait at least 2 seconds.

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

6. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-148, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010122037

Regarding Wiring Diagram information, refer to 

HAC-253, "Wiring Diagram"

.

1.

CHECK PTC HEATER OUTLET AIR TEMPERATURE SENSOR VOLTAGE SIGNAL

1. Turn power switch ON.

2. Operate the automatic air conditioning system.

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

Is the inspection result normal?

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B27C2

PTC OUT AIR TEMP SENS

The PTC heater outlet air temperature sensor 
recognition temperature is too low [less than 

−

42

°C (−44°F)].

• PTC heater outlet air temperature 

sensor

• A/C auto amp.
• Harness or connectors

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

B27C3

The PTC heater outlet air temperature sensor 
recognition temperature is too high [more than 
200

°C (392°F)].

A/C auto amp.

Test condition

Voltage signal

connector

+

−

Terminal

M55

17

10

• Power  switch  ON
• When air conditioner is op-

erating

JSIIA1778ZZ