Nissan Leaf. Manual — part 286
U1511 BRAKE POWER SUPPLY BACKUP UNIT COMMUNICATION
BR-465
< DTC/CIRCUIT DIAGNOSIS >
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7. Check the 15A fuse (#75).
8. Check the continuity and for short circuit between harness connector terminal 28 of electrically-driven
intelligent brake unit and 15A fuse (#75).
Is the inspection result normal?
YES
>> Perform trouble diagnosis for 12V battery power supply. Refer to
.
NO
>> Repair or replace error-detected parts and GO TO 10.
10.
PERFORM SELF-DIAGNOSIS (4)
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. 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 “U1511” detected?
YES
>> GO TO 11.
NO
>> INSPECTION END
11.
CHECK GROUND CIRCUIT
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.
Is the inspection result normal?
YES
>> GO TO 13.
Electrically-driven intelligent brake unit
—
Continuity
Connector
Terminal
E34
32
Ground
Existed
BR-466
< DTC/CIRCUIT DIAGNOSIS >
U1511 BRAKE POWER SUPPLY BACKUP UNIT COMMUNICATION
NO
>> Repair or replace error-detected parts and GO TO 12.
12.
PERFORM SELF-DIAGNOSIS (5)
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. 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 “U1511” detected?
YES
>> GO TO 13.
NO
>> INSPECTION END
13.
CHECK DATA MONITOR (1)
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”, “DATE 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:
U1511 BRAKE POWER SUPPLY BACKUP UNIT COMMUNICATION
BR-467
< DTC/CIRCUIT DIAGNOSIS >
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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 “U1511” detected?
YES
>> GO TO 15.
NO
>> INSPECTION END
15.
CHECK BRAKE POWER SUPPLY BACKUP UNIT CIRCUIT
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. Disconnect the brake power supply backup unit harness connector.
6. Check the continuity between electrically-driven intelligent brake unit and brake power supply backup unit.
7. Check the continuity between electrically-driven intelligent brake unit and ground.
Electrically-driven intelligent brake unit
Brake power supply backup unit
Continuity
Connector
Terminal
Connector
Terminal
E34
31
B15
1
Existed
31
4
Not existed
31
5
Not existed
22
1
Not existed
22
4
Existed
22
5
Not existed
37
1
Not existed
37
4
Not existed
37
5
Existed
BR-468
< DTC/CIRCUIT DIAGNOSIS >
U1511 BRAKE POWER SUPPLY BACKUP UNIT COMMUNICATION
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Repair or replace error-detected parts.
16.
CHECK BRAKE POWER SUPPLY BACKUP UNIT POWER SUPPLY
1. Connect 12V battery cable to negative terminal.
2. Check the voltage between the brake power supply backup unit harness connector and ground.
3. Turn the power switch ON without depressing the brake pedal.
CAUTION:
Never set the vehicle to READY.
4. Check the voltage between the brake power supply backup unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> GO TO 17.
17.
CHECK BRAKE POWER SUPPLY BACKUP UNIT POWER SUPPLY CIRCUIT
1. Turn the power switch OFF to exit CONSULT.
2. Disconnect 12V battery cable from negative terminal. Refer to
BR-6, "Precaution for Removing 12V Bat-
3. Check the 15A fuse (#82).
4. Check the continuity and for short circuit between harness connector terminal 6 of brake power supply
backup unit and 15A fuse (#82).
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> Perform trouble diagnosis for 12V battery power supply. Refer to
.
18.
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.
Electrically-driven intelligent brake unit
—
Continuity
Connector
Terminal
E34
31
Ground
Not existed
22
Not existed
37
Not existed
32
Existed
Brake power supply backup unit
—
Voltage
(Approx.)
Connector
Terminal
B15
6
Ground
10
− 16 V
Brake power supply backup unit
—
Voltage
(Approx.)
Connector
Terminal
B15
6
Ground
10
− 16 V
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