Nissan Leaf. Manual - part 246

 

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Nissan Leaf. Manual - part 246

 

 

C1A98 BRAKE POWER SUPPLY BACKUP UNIT

BR-305

< DTC/CIRCUIT DIAGNOSIS >

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2. Connect 12V battery cable to negative terminal.

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

CAUTION:

Never set the vehicle to READY.

4. Repeat step 3 two or more times.

CAUTION:

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

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

6. 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.

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

CAUTION:

Never set the vehicle to READY.

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

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

10. 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.

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

CAUTION:

Never set the vehicle to READY.

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

13. Release brake pedal.

14. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1A98” detected?

YES

>> GO TO 13.

NO

>> INSPECTION END

13.

CHECK DATA MONITOR

With CONSULT

1. Connect the electrically-driven intelligent brake unit harness connector.

2. Connect 12V battery cable to negative terminal.

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

CAUTION:

Never set the vehicle to READY.

4. Repeat step 3 two or more times.

CAUTION:

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

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

6. Check the “MOTOR POWER SUPPLY” and “CONTROL MODULE POWER”. Refer to 

BR-33, "Reference

Value"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

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

BR-510, "Removal and installation"

.

14.

PERFORM SELF-DIAGNOSIS (6)

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:

BR-306

< DTC/CIRCUIT DIAGNOSIS >

C1A98 BRAKE POWER SUPPLY BACKUP UNIT

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 “C1A98”, “C1A6B”, “C1A6C”, “C1A6D”, “C1AC8” or “C1AD0” detected?

YES (C1A98)>>GO TO 15.

YES (C1A6B)>>Refer to 

BR-123, "Diagnosis Procedure"

.

YES (C1A6C)>>Refer to 

BR-134, "Diagnosis Procedure"

.

YES (C1A6D)>>Refer to 

BR-142, "Diagnosis Procedure"

.

YES (C1AC8)>>Refer to 

BR-429, "Diagnosis Procedure"

.

YES (C1AD0)>>Refer to 

BR-440, "Diagnosis Procedure"

.

NO

>> INSPECTION END

15.

CHECK CIRCUIT BETWEEN ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT AND BRAKE

POWER SUPPLY BACKUP UNIT
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. Check the continuity between electrically-driven intelligent brake unit and ground.

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

7. Disconnect the brake power supply backup unit harness connector.

8. Check the continuity between electrically-driven intelligent brake unit and brake power supply backup unit.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Repair or replace error-detected parts and GO TO 16.

16.

CHECK BRAKE POWER SUPPLY BACKUP UNIT GROUND CIRCUIT

Electrically-driven intelligent brake unit

—

Continuity

Connector

Terminal

E34

32

Ground

Existed

Electrically-driven intelligent brake unit

—

Continuity

Connector

Terminal

E34

31

Ground

Not existed

Electrically-driven intelligent brake unit

Brake power supply backup unit

Continuity

Connector

Terminal

Connector

Terminal

E34

31

B15

1

Existed

C1A98 BRAKE POWER SUPPLY BACKUP UNIT

BR-307

< DTC/CIRCUIT DIAGNOSIS >

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Check the continuity between brake power supply backup unit and ground.

Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Repair or replace error-detected parts and GO TO 17.

17.

PERFORM SELF-DIAGNOSIS (7)

With CONSULT

1. Connect the electrically-driven intelligent brake unit harness connector.

2. Connect the brake power supply backup unit harness connector.

3. Connect 12V battery cable to negative terminal.

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

CAUTION:

Never set the vehicle to READY.

5. Repeat step 4 two or more times.

CAUTION:

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

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

7. 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.

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

CAUTION:

Never set the vehicle to READY.

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

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

11. 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.

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

CAUTION:

Never set the vehicle to READY.

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

14. Release brake pedal.

15. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1A98” detected?

YES

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

BR-510, "Removal and installation"

.

NO

>> INSPECTION END

Brake power supply backup unit

—

Continuity

Connector

Terminal

B15

2

Ground

Existed

BR-308

< DTC/CIRCUIT DIAGNOSIS >

C1A99 BRAKE POWER SUPPLY BACKUP UNIT

C1A99 BRAKE POWER SUPPLY BACKUP UNIT

DTC Logic

INFOID:0000000010123063

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 “C1A99” detected?

YES

>> Proceed to 

BR-308, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010123064

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.

DTC

Display item

Malfunction detection condition

Possible causes

C1A99

BACKUP POWER SUPPLY-3

A malfunction is detected in the backup power supply 
circuit. (Abnormal diode in the control module of the 
electrically-driven intelligent brake unit)

• Harness or connector
• Electrically-driven intelligent 

brake unit

 

 

 

 

 

 

 

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