Nissan Leaf. Manual - part 288

POWER SUPPLY AND GROUND CIRCUIT

BR-473

< DTC/CIRCUIT DIAGNOSIS >

C

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B

BR

N

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Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace error-detected parts.

9.

CHECK TERMINAL

• Check for failures in the pin terminals and connections of the electrically-driven intelligent brake unit harness

connector.

• Check that there is no malfunction in pin terminal and connection of IPDM E/R harness connector.

• Check for failures of pin terminals and connections in brake power supply backup unit harness connector.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace error-detected parts.

Brake power supply backup unit

—

Continuity

Connector

Terminal

B15

2

Ground

Existed

BR-474

< DTC/CIRCUIT DIAGNOSIS >

WARNING BUZZER

WARNING BUZZER

Diagnosis Procedure

INFOID:0000000010123102

1.

CHECK POWER AND GROUND CIRCUITS OF ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT

Perform diagnosis of electrically-driven intelligent brake unit power and ground circuits. 

BR-470, "Diagnosis

Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK WARNING BUZZER CIRCUIT

1. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

2. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

3. Disconnect 12V battery cable from negative terminal. Refer to 

BR-6, "Precaution for Removing 12V Bat-

tery"

.

4. Disconnect the electrically-driven intelligent brake unit harness connector.

5. Disconnect buzzer harness connector.

6. Check the continuity between electrically-driven intelligent brake unit and warning buzzer.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK WARNING BUZZER

Check the warning buzzer. Refer to 

BR-474, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace the electrically-driven intelligent brake unit. Refer to 

BR-510, "Removal and installation"

.

NO

>> Replace the warning buzzer. Refer to 

BR-515, "Removal and Installation"

.

Component Inspection

INFOID:0000000010123103

1.

CHECK WARNING BUZZER

1. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

2. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

3. Disconnect 12V battery cable from negative terminal. Refer to 

BR-6, "Precaution for Removing 12V Bat-

tery"

.

4. Disconnect buzzer harness connector.

5. Apply voltage of 12V between warning buzzer connector terminals 1 and 2.

Electrically-driven intelligent brake 

unit

Warning buzzer

Continuity

Connector

Terminal

Connector

Terminal

E34

36

M13

1

Existed

20

1

Not existed

36

2

Not existed

20

2

Existed

WARNING BUZZER

BR-475

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

G

H

I

J

K

L

M

A

B

BR

N

O

P

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the warning buzzer. Refer to 

BR-515, "Removal and Installation"

.

Condition

Warning buzzer

Voltage applied

Sound

Voltage not applied

No sound

BR-476

< DTC/CIRCUIT DIAGNOSIS >

BRAKE WARNING LAMP

BRAKE WARNING LAMP

Component Function Check

INFOID:0000000010123106

1.

CHECK BRAKE WARNING LAMP FUNCTION (1)

Check that brake warning lamp turns ON for approximately several second after power switch is turned ON.

CAUTION:

Never set the vehicle to READY.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refer to 

BR-476, "Diagnosis Procedure"

.

2.

CHECK BRAKE SYSTEM WARNING LAMP FUNCTION (2)

Check that brake warning lamp in combination meter turns ON/OFF when parking brake is operated.

NOTE:

Brake warning lamp turns ON when parking brake is operated (when parking brake switch is ON).
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check parking brake system. Refer to 

BRC-142, "Diagnosis Procedure"

.

3.

CHECK BRAKE WARNING LAMP FUNCTION (2)

Check that brake warning lamp in combination meter turns ON or OFF when brake fluid level switch is oper-

ated while brake fluid level in reservoir tank is at the specified level.

NOTE:

Brake warning lamp turns ON when brake fluid is less than the specified level (when brake fluid level switch is

ON).
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Check the brake fluid level switch system. Refer to 

BRC-115, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010123107

1.

CHECK POWER AND GROUND CIRCUITS OF ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT

Perform diagnosis of electrically-driven intelligent brake unit power and ground circuits. Refer to 

BR-470,

"Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT

Start CONSULT and perform “BRAKE” and “ABS” self-diagnosis.
Is malfunction detected?

YES

>> Check the error-detected system.

• “BRAKE”: Refer to 

BR-29, "CONSULT Function"

.

• “ABS”: Refer to 

BRC-46, "CONSULT Function"

.

NO

>> GO TO 3.

3.

CHECK THAT BRAKE WARNING LAMP TURNS ON

Check the combination meter. Refer to 

MWI-49, "CONSULT Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> Replace the electrically-driven intelligent brake unit. Refer to 

BR-510, "Removal and installation"

.

NO

>> Replace combination meter. Refer to 

MWI-102, "Removal and Installation"

.