Nissan Leaf. Manual - part 289

BRAKE SYSTEM WARNING LAMP

BR-477

< DTC/CIRCUIT DIAGNOSIS >

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BRAKE SYSTEM WARNING LAMP

Component Function Check

INFOID:0000000010123108

1.

CHECK BRAKE SYSTEM WARNING LAMP FUNCTION

Check that brake system 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

>> INSPECTION END

NO

>> Proceed to 

BR-477, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010123109

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.

PERFORM SELF-DIAGNOSIS

With CONSULT

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

YES

>> Check the error-detected system.

• “BRAKE”: Refer to 

BR-38, "DTC Index"

.

• “ABS”: Refer to 

BRC-46, "CONSULT Function"

.

NO

>> GO TO 3.

3.

CHECK BRAKE SYSTEM WARNING LAMP ILLUMINATION 

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"

.

BR-478

< SYMPTOM DIAGNOSIS >

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

SYMPTOM DIAGNOSIS

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting Chart

INFOID:0000000010283843

Use the chart below to find the cause of the symptom. If necessary, repair or replace these parts.

×: Applicable

Reference page

BR-496

, 

BR-498

BR-496

, 

BR-498

BR-517

, 

BR-521

BR-496

, 

BR-498

BR-496

, 

BR-498

BR-496

, 

BR-498

BR-496

, 

BR-498

BR-496

, 

BR-498

BR-496

, 

BR-498

BR-496

, 

BR-498

NV

H 

in

 F

A

X

, R

A

X

 a

nd

 FS

U,

 R

S

U

 s

ec

tio

n

NV

H 

in

 W

T

 s

e

cti

on

NV

H 

in

 W

T

 s

e

cti

on

NV

H 

in

 F

A

X

 se

ct

ion

NV

H 

in

 S

T

 s

ec

tio

n

Possible cause and
SUSPECTED PARTS

Pad

s - 

da

ma

ge

d

Pad

s 

- un

ev

en

 we

ar

Sh

im

s da

ma

ge

d

Roto

r im

b

ala

nc

e

Ro

to

r da

ma

ge

Rotor runout

Roto

r d

efo

rma

tio

n

Roto

r d

efl

ectio

n

Rotor rust

Roto

r th

ickn

ess 

va

ria

tio

n

AXLE AND SUSPE

NSION

TIRE

ROA

D

 WHEEL

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IV

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 SH

AF

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STEERI

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Symptom

BRAKE

Noise

×

×

×

×

×

×

×

×

Shake

×

×

×

×

×

×

Shimmy, Judder

×

×

×

×

×

×

×

×

×

×

×

UNEXPECTED BRAKE PEDAL REACTION

BR-479

< SYMPTOM DIAGNOSIS >

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UNEXPECTED BRAKE PEDAL REACTION

Description

INFOID:0000000010123110

A malfunction of brake pedal feel (height or others) is detected when the brake pedal is depressed.

Diagnosis Procedure

INFOID:0000000010123111

1.

CHECK AXLE

Check that there is no significant looseness of axle.

• Front axle: Refer to 

FAX-7, "Inspection"

.

• Rear axle: Refer to 

RAX-6, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK DISC ROTOR

Check the disc rotor runout.

• Front: Refer to 

BR-496, "DISC ROTOR : Inspection and Adjustment"

.

• Rear: Refer to 

BR-498, "DISC ROTOR : Inspection and Adjustment"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Grind disc rotor.

3.

CHECK BRAKE FLUID LEAKAGE

Check the brake fluid leakage.

• Front: Refer to 

BR-506, "FRONT : Inspection"

.

• Rear: Refer to 

BR-509, "REAR : Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK BRAKE PEDAL

Check the brake pedal items. Refer to 

BR-490, "Inspection and Adjustment"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Adjust the brake pedal items. Refer to 

BR-490, "Inspection and Adjustment"

.

5.

CHECK BRAKING FORCE

Check the braking force.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Check each component of brake system.

6.

CHECK BRAKE PERFORMANCE

Disconnect ABS actuator and electric unit (control unit) connector so that ABS does not operate. Check that

brake force is normal in this condition. Connect harness connectors after checking.
Is the inspection result normal?

YES

>> Normal

NO

>> Check each component of brake system.

BR-480

< SYMPTOM DIAGNOSIS >

THE BRAKING DISTANCE IS LONG

THE BRAKING DISTANCE IS LONG

Description

INFOID:0000000010123112

Brake stopping distance is long when ABS function is operated.

Diagnosis Procedure

INFOID:0000000010123113

CAUTION:

Brake stopping distance on slippery road like rough road, gravel road, or snowy road may become

longer when ABS is operated than when ABS is not operated.

1.

CHECK 12V BATTERY

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. Check the 12V battery terminal connections. Refer to 

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

 and

PG-83, "Work Flow"

.

4. Check the 12V battery. Refer to 

PG-83, "Work Flow"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts and GO TO 2.

2.

PERFORM SELF-DIAGNOSIS (1)

With CONSULT

1. Connect 12V battery cable to negative terminal.

2. Turn the power switch OFF to ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

3. Repeat step 2 two or more times.

CAUTION:

Be sure to wait for 5 seconds or more after turning the power switch OFF.

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

5. 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.

6. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

7. Start CONSULT and erase self-diagnosis result of “BRAKE”.

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

9. 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.

10. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

11. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.

12. Release brake pedal.

13. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC detected?

YES

>> Check the DTC. Refer to 

BR-38, "DTC Index"

. GO TO 3.

NO

>> INSPECTION END

3.

CHECK CONNECTOR TERMINALS

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