Nissan Leaf. Manual - part 775

B2772 PTC HEATER

HAC-103

< 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

B2772 PTC HEATER

DTC Logic

INFOID:0000000010121813

DTC DETECTION 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-103, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121814

1.

REPLACE PTC HEATER

Replace PTC heater. Refer to 

HAC-201, "Removal and Installation"

.

>> Inspection End.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B2772

PTC HEATER VOLTAGE

When the supply voltage input to the PTC heat-
er is the specified voltage value or less.

• PTC heater
• High voltage harness or connectors

(PTC heater high voltage circuit is 
open or shorted.)

HAC-104

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B2777, B2779, B277B PTC HEATER

B2777, B2779, B277B PTC HEATER

DTC Logic

INFOID:0000000010121815

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn power switch OFF.

2. Set the vehicle to READY.

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

4. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-104, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121816

Regarding Wiring Diagram information, refer to 

HAC-61, "Wiring Diagram"

.

1.

CHECK PTC HEATER COMMUNICATION LINE FOR OPEN

1. Turn power switch OFF.

2. Disconnect PTC heater and A/C auto amp. connector.

3. Check continuity between PTC heater harness connector and A/C auto amp harness connector.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK PTC HEATER COMMUNICATION LINE FOR SHORT

Check continuity between PTC heater harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B2777

PTC HEATER LIN COMMU-
NICATION

When there is an error in the signal sent from 
the PTC heater.

• PTC heater
• A/C auto amp.
• Harness or connectors

(PTC heater circuit is open or short-
ed.)

B2779

PTC HEATER COMMUNI-
CATION

When there is an error in the signal sent from 
the A/C auto amp. or there is an error in the sig-
nal received by the PTC heater.

B277B

HVAC LIN COMMUNICA-
TION

When there is an error in the signal send from 
the A/C auto amp.

PTC heater

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M145

4

M55

40

Yes

PTC heater

−

Continuity

Connector

Terminal

M145

4

Ground

No

B2777, B2779, B277B PTC HEATER

HAC-105

< 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

3.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace malfunctioning components.

4.

CHECK A/C AUTO AMP.

With CONSULT

1. Set the vehicle to READY.

2. Using CONSULT, perform “MODE6” of “HVAC TEST” in “Active Test” of HVAC”. Refer to 

HAC-47, "CON-

SULT Function"

.

3. Check that the PTC heater operates normally.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace A/C auto amp. (Refer to 

HAC-187, "Removal and Installation"

). Then GO TO 5.

5.

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC confirmation procedure. Refer to 

HAC-104, "DTC Logic"

.

Is DTC B2777, B2779 or B277B detected?

YES

>> Replace PTC heater. Refer to 

HAC-201, "Removal and Installation"

.

NO

>> Inspection End.

HAC-106

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27A0, B27A1 INTAKE DOOR MOTOR

B27A0, B27A1 INTAKE DOOR MOTOR

DTC Logic

INFOID:0000000010121817

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"

.

*: A/C auto amp. operates intake door motor according to target value of PBR opening angle at 40% when per-

forming self-diagnosis.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Set the vehicle to READY.

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

3. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-106, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121818

Regarding Wiring Diagram information, refer to 

HAC-61, "Wiring Diagram"

.

1.

CHECK INTAKE DOOR MOTOR OPERATION

1. Turn power switch ON.

2. Operate intake switch and check by operation sound that intake door motor operates.
Does the intake door motor operate?

YES

>> GO TO 2.

NO

>> GO TO 8.

2.

CHECK INTAKE DOOR MOTOR PBR POWER SUPPLY

1. Disconnect intake door motor connector.

2. Turn power switch ON.

3. Check voltage between intake door motor harness connector and ground.

Is the inspection result normal?

DTC

Items

(CONSULT screen terms)

DTC detection condition

*

Possible cause

B27A0

INTAKE DOOR MOTOR

PBR opening angle of intake door motor is 50% 
or more. (PBR feedback signal voltage of intake 
door motor is 2.5 V or more).

• Intake door motor
• Intake door motor system installa-

tion condition

• A/C auto amp.
• Harness or connectors

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

B27A1

PBR opening angle of intake door motor is 30% 
or less. (PBR feedback signal voltage of intake 
door motor is 1.5 V or less).

+

−

Voltage

(Approx.)

Intake door motor

Connector

Terminal

M54

1

Ground

5 V