Nissan Leaf. Manual - part 200

C1A69 MOTOR

BR-121

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

G

H

I

J

K

L

M

A

B

BR

N

O

P

Never set the vehicle to READY.

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

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

8. 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.

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

CAUTION:

Never set the vehicle to READY.

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

11. Release brake pedal.

12. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1A69” detected?

YES

>> GO TO 15.

NO

>> INSPECTION END

15.

CHECK DATA MONITOR (2)

With CONSULT

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

CAUTION:

Never set the vehicle to READY.

2. Repeat step 1 two or more times.

CAUTION:

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

3. Start CONSULT and select “BRAKE”, “DATA MONITOR” according this order.

4. Check the “MOTOR TEMPERATURE”. Refer to 

BR-33, "Reference Value"

.

“MOTOR TEMPERATURE” is 125 

°C (257 °F) or more?

YES

>> GO TO 16.

NO

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

BR-510, "Removal and installation"

.

16.

CHECK MOTOR ROOM

Check for any locations of abnormal heating around the electrically-driven intelligent brake unit.
Are there any heated locations?

YES

>> Perform diagnosis of the heated locations, and wait for the temperature to fall. GO TO 17.

NO

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

BR-510, "Removal and installation"

.

17.

PERFORM SELF-DIAGNOSIS (7)

With CONSULT

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

CAUTION:

Never set the vehicle to READY.

2. Repeat step 1 two or more times.

CAUTION:

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

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

4. 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.

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

CAUTION:

Never set the vehicle to READY.

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

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

8. 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.

BR-122

< DTC/CIRCUIT DIAGNOSIS >

C1A69 MOTOR

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

CAUTION:

Never set the vehicle to READY.

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

11. Release brake pedal.

12. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1A69” detected?

YES

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

BR-510, "Removal and installation"

.

NO

>> INSPECTION END

C1A6B BRAKE POWER SUPPLY BACKUP UNIT

BR-123

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

G

H

I

J

K

L

M

A

B

BR

N

O

P

C1A6B BRAKE POWER SUPPLY BACKUP UNIT

DTC Logic

INFOID:0000000010123019

DTC DETECTION LOGIC

DTC REPRODUCTION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power switch OFF and

wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

With CONSULT

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

CAUTION:

Never set the vehicle to READY.

2. Repeat step 1 two or more times.

CAUTION:

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

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

4. 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.

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

CAUTION:

Never set the vehicle to READY.

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

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

8. 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.

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

CAUTION:

Never set the vehicle to READY.

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

11. Release brake pedal.

12. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1A6B” detected?

YES

>> Proceed to 

BR-123, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010123020

1.

CHECK 12V BATTERY

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

DTC

Display item

Malfunction detection condition

Possible causes

C1A6B

POWER SUPPLY BACKUP 
UNIT

• Reception/transmission of an unspecified signal for 

2 consecutive seconds or more via brake power 
supply backup communication line.

• Occurrence of a open in the wake up signal circuit 

of brake power supply backup unit.

• Harness or connector
• Fuse
• Brake power supply backup 

unit

• Electrically-driven intelligent 

brake unit

BR-124

< DTC/CIRCUIT DIAGNOSIS >

C1A6B BRAKE POWER SUPPLY BACKUP UNIT

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 “C1A6B” detected?

YES

>> 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.

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, then check for failures of pin

terminals and connections.

5. Disconnect the brake power supply backup unit harness connector, then check for failures of pin terminals

and connections.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts and GO TO 4.