Nissan Leaf. Manual — part 205
C1A6C BRAKE POWER SUPPLY BACKUP UNIT
BR-141
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
G
H
I
J
K
L
M
A
B
BR
N
O
P
Never operate the vehicle while waiting.
3. Disconnect 12V battery cable from negative terminal. Refer to
BR-6, "Precaution for Removing 12V Bat-
4. Check the 15A fusible link (#82).
5. 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
>> Replace the brake power supply backup unit. Refer to
BR-513, "Removal and Installation"
NO
>> Perform trouble diagnosis for 12V battery power supply. Refer to
.
BR-142
< DTC/CIRCUIT DIAGNOSIS >
C1A6D BRAKE POWER SUPPLY BACKUP UNIT
C1A6D BRAKE POWER SUPPLY BACKUP UNIT
DTC Logic
INFOID:0000000010123023
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 “C1A6D” detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010123024
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.
DTC
Display item
Malfunction detection condition
Possible causes
C1A6D
POWER SUPPLY BACKUP UNIT
OUTPUT
An internal malfunction (abnormal output circuit)
is detected in brake power supply backup unit.
• Harness or connector
• Brake power supply backup
unit
• Electrically-driven intelligent
brake unit
C1A6D BRAKE POWER SUPPLY BACKUP UNIT
BR-143
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
G
H
I
J
K
L
M
A
B
BR
N
O
P
CAUTION:
Never operate the vehicle while waiting.
3. Check the 12V battery terminal connections. Refer to
BR-6, "Precaution for Removing 12V Battery"
and
.
4. Check the 12V battery. Refer to
.
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 “C1A6D” 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-
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)
BR-144
< DTC/CIRCUIT DIAGNOSIS >
C1A6D BRAKE POWER SUPPLY BACKUP UNIT
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 “C1A6D” detected?
YES
>> GO TO 5.
NO
>> INSPECTION END
5.
CHECK POWER SWITCH ON POWER SUPPLY
1. Connect the brake power supply backup unit harness connector.
2. Connect 12V battery cable to negative terminal.
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. Disconnect 12V battery cable from negative terminal. Refer to
BR-6, "Precaution for Removing 12V Bat-
6. Disconnect the electrically-driven intelligent brake unit harness connector.
7. Connect 12V battery cable to negative terminal.
8. Check the voltage between the electrically-driven intelligent brake unit harness connector and ground.
9. Turn the power switch ON without depressing the brake pedal.
CAUTION:
Never set the vehicle to READY.
10. Check the voltage between the electrically-driven intelligent brake unit harness connector and ground.
Electrically-driven intelligent brake unit
—
Voltage
(Approx.)
Connector
Terminal
E34
26
Ground
0 V
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