Nissan Leaf. Instruction — 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
.
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
.
YES (C1A6C)>>Refer to
YES (C1A6D)>>Refer to
YES (C1AC8)>>Refer to
YES (C1AD0)>>Refer to
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-
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
.
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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