Nissan Leaf. Instruction — part 244

C1A91 CONTROL MODULE

BR-297

< DTC/CIRCUIT DIAGNOSIS >

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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 “C1A91” detected?

YES

>> GO TO 18.

NO

>> INSPECTION END

18.

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 19.

NO

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

BR-510, "Removal and installation"

.

19.

PERFORM SELF-DIAGNOSIS (8)

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 “C1A91” detected?

YES

>> GO TO 20.

BR-298

< DTC/CIRCUIT DIAGNOSIS >

C1A91 CONTROL MODULE

NO

>> INSPECTION END

20.

CHECK BCM SYSTEM

With CONSULT

Perform self-diagnosis for “BCM”. Refer to

BCS-23, "BCM : CONSULT Function (BCM - BCM)"

.

Is any DTC detected?

YES

>> Check the DTC. Refer to

BCS-48, "DTC Index"

. GO TO 21.

NO

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

BR-510, "Removal and installation"

.

21.

PERFORM SELF-DIAGNOSIS (9)

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 “C1A91” detected?

YES

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

BR-510, "Removal and installation"

.

NO

>> INSPECTION END

C1A98 BRAKE POWER SUPPLY BACKUP UNIT

BR-299

< DTC/CIRCUIT DIAGNOSIS >

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C1A98 BRAKE POWER SUPPLY BACKUP UNIT

DTC Logic

INFOID:0000000010123061

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 “C1A98” detected?

YES

>> Proceed to

BR-299, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010123062

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

C1A98

BACKUP POWER SUPPLY-2

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

• Harness or connector
• Electrically-driven intelligent

brake unit

BR-300

< DTC/CIRCUIT DIAGNOSIS >

C1A98 BRAKE POWER SUPPLY BACKUP UNIT

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 “C1A98” 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.

4.

PERFORM SELF-DIAGNOSIS (2)

With CONSULT

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