Nissan Leaf. Manual - part 823

B2777, B2779, B277B PTC HEATER

HAC-295

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

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B2777, B2779, B277B PTC HEATER

DTC Logic

INFOID:0000000010122002

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-295, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010122003

Regarding Wiring Diagram information, refer to 

HAC-253, "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

HAC-296

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

B2777, B2779, B277B PTC HEATER

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-347, "Removal and Installation"

). Then GO TO 5.

5.

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC confirmation procedure. Refer to 

HAC-295, "DTC Logic"

.

Is DTC B2777, B2779 or B277B detected?

YES

>> Replace PTC heater. Refer to 

HAC-359, "Removal and Installation"

.

NO

>> Inspection End.

B2780 ELECTRIC COMPRESSOR

HAC-297

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

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B2780 ELECTRIC COMPRESSOR

DTC Logic

INFOID:0000000010122004

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 cold 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-297, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010122005

1.

REPLACE ELECTRIC COMPRESSOR

Replace electric compressor. Refer to 

HA-95, "Removal and Installation"

.

>> Inspection End.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B2780

COMPRESSOR 
ROM,RAM,AD

• When an error is detected in the ROM and 

RAM area data.

• When an error is detected in the AD value 

(circuit that converts the analog value to a 
digital value).

Electric compressor

HAC-298

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

B2781 ELECTRIC COMPRESSOR

B2781 ELECTRIC COMPRESSOR

DTC Logic

INFOID:0000000010122006

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 cold 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-298, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010122007

1.

REPLACE ELECTRIC COMPRESSOR

Replace electric compressor. Refer to 

HA-95, "Removal and Installation"

.

>> Inspection End.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B2781

COMP IPM TEMP SENSOR

IPM temp sensor is open or shorted.

Electric compressor