Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

CHECK 12V BATTERY
1. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
2. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
3. Check the 12V battery terminal connections. Refer to PRECAUTION FOR REMOVING 12V BATTERY and WORK FLOW .
4. Check the 12V battery. Refer to WORK FLOW .
Is the inspection result normal?

YES

GO TO STEP 2 .

NO

Repair or replace error-detected parts and GO TO STEP 2 .

PERFORM SELF-DIAGNOSIS (1)

With CONSULT
1. Connect 12V battery cable to negative terminal.
2. Turn the ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
3. Repeat step 2 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
4. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
5. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
6. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
7. Start CONSULT, and erase self-diagnosis result of "BRAKE" after record or print self-diagnosis results and freeze frame data (FFD).
8. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
9. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
10. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
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 "C1AC1" detected?

YES

GO TO STEP 3 .

NO

INSPECTION END

CHECK CONNECTOR TERMINALS
1. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
2. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
3. Disconnect 12V battery cable from negative terminal. Refer to PRECAUTION FOR REMOVING 12V BATTERY .
4. Disconnect the electrically-driven intelligent brake unit harness connector, then check for failures of pin terminals and connections.
Is the inspection result normal?

YES

GO TO STEP 5 .

NO

Repair or replace error-detected parts and GO TO STEP 4 .

PERFORM SELF-DIAGNOSIS (2)

With CONSULT
1. Connect the electrically-driven intelligent brake unit harness connector.
2. Connect 12V battery cable to negative terminal.
3. Turn the ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
4. Repeat step 3 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
5. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
6. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
7. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
8. Start CONSULT, and erase self-diagnosis result of "BRAKE" after record or print self-diagnosis results and freeze frame data (FFD).
9. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
10. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
11. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
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 "C1AC1" detected?

YES

GO TO STEP 5 .

NO

INSPECTION END

CHECK IGNITION POWER SUPPLY

Turn the ignition switch OFF and disconnect CONSULT from data link connector.
Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
CAUTION:
Never operate the vehicle.
Disconnect 12V battery cable from negative terminal. Refer to PRECAUTION FOR REMOVING 12V BATTERY .
Disconnect the electrically-driven intelligent brake unit harness connector.
Connect 12V battery cable to negative terminal.

Check the voltage between the electrically-driven intelligent brake unit harness connector and ground.

Electrically-driven intelligent brake unit		-	Voltage (Approx.)
Connector	Terminal	-	Voltage (Approx.)
E40	26	Ground	0 V

Turn the ignition switch ON without depressing the brake pedal.
CAUTION:
Never set the vehicle to READY/Never start the engine.

Check the voltage between the electrically-driven intelligent brake unit harness connector and ground.

Electrically-driven intelligent brake unit		-	Voltage (Approx.)
Connector	Terminal	-	Voltage (Approx.)
E40	26	Ground	10 - 16 V

Is the inspection result normal?

YES

GO TO STEP 8 .

GO TO STEP 6 .

CHECK IGNITION POWER SUPPLY CIRCUIT

Disconnect 12V battery cable from negative terminal. Refer to PRECAUTION FOR REMOVING 12V BATTERY .
Check the 10A fuse (#54).
Disconnect IPDM E/R harness connector.

Check the continuity between electrically-driven intelligent brake unit and IPDM E/R.

Electrically-driven intelligent brake unit		IPDM E/R		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E40	26	E121	35	Existed

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

Electrically-driven intelligent brake unit		-	Continuity
Connector	Terminal	-	Continuity
E40	26	Ground	Not existed

Is the inspection result normal?

YES

Perform trouble diagnosis for ignition power supply.

Repair or replace error-detected parts and GO TO STEP 7 .

PERFORM SELF-DIAGNOSIS (3)

With CONSULT
1. Connect the electrically-driven intelligent brake unit harness connector.
2. Connect IPDM E/R harness connector.
3. Connect 12V battery cable to negative terminal.
4. Turn the ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
5. Repeat step 4 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
6. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
7. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
8. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
9. Start CONSULT, and erase self-diagnosis result of "BRAKE" after record or print self-diagnosis results and freeze frame data (FFD).
10. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
11. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
12. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
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 "C1AC1" detected?

YES

GO TO STEP 8 .

NO

INSPECTION END

CHECK 12V BATTERY POWER SUPPLY

Turn the ignition switch OFF and disconnect CONSULT from data link connector.
Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
CAUTION:
Never operate the vehicle.
Disconnect 12V battery cable from negative terminal. Refer to PRECAUTION FOR REMOVING 12V BATTERY .
Disconnect the electrically-driven intelligent brake unit harness connector.
Connect 12V battery cable to negative terminal.

Check the voltage between the electrically-driven intelligent brake unit harness connector terminal.

Electrically-driven intelligent brake unit		Voltage (Approx.)
Connector	Terminal	Voltage (Approx.)
E40	1 - 32	10 - 16 V
	2 - 32
	28 - 32

Turn the ignition switch ON without depressing the brake pedal.
CAUTION:
Never set the vehicle to READY/Never start the engine.

Check the voltage between the electrically-driven intelligent brake unit harness connector terminal.

Electrically-driven intelligent brake unit		Voltage (Approx.)
Connector	Terminal	Voltage (Approx.)
E40	1 - 32	10 - 16 V
	2 - 32
	28 - 32

Is the inspection result normal?

YES

GO TO STEP 11 .

GO TO STEP 9 .

CHECK 12V BATTERY POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
2. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
3. Disconnect 12V battery cable from negative terminal. Refer to PRECAUTION FOR REMOVING 12V BATTERY .
4. Check the 50A fusible link (#D).
5. Check the continuity and for short circuit between electrically-driven intelligent brake unit harness connector terminal (1) and 50A fusible link (#D).
6. Check the continuity and for short circuit between electrically-driven intelligent brake unit harness connector terminal (2) and 50A fusible link (#D).
7. Check the 10A fuse (#83).
8. Check the continuity and for short circuit between electrically-driven intelligent brake unit harness connector terminal (28) and 10A fuse (#83).
Is the inspection result normal?

YES

Perform trouble diagnosis for 12V battery power supply.

NO

Repair or replace error-detected parts and GO TO STEP 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 ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
4. Repeat step 3 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
5. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
6. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
7. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
8. Start CONSULT, and erase self-diagnosis result of "BRAKE" after record or print self-diagnosis results and freeze frame data (FFD).
9. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
10. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
11. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
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 "C1AC1" detected?

YES

GO TO STEP 11.

NO

INSPECTION END

CHECK GROUND CIRCUIT

Turn the ignition switch OFF and disconnect CONSULT from data link connector.
Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
CAUTION:
Never operate the vehicle.
Disconnect 12V battery cable from negative terminal. Refer to PRECAUTION FOR REMOVING 12V BATTERY .
Disconnect the electrically-driven intelligent brake unit harness connector.

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

Electrically-driven intelligent brake unit		-	Continuity
Connector	Terminal	-	Continuity
E40	32	Ground	Existed

Is the inspection result normal?

YES

GO TO STEP 13 .

Repair or replace error-detected parts and GO TO STEP 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 ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
4. Repeat step 3 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
5. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
6. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
7. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
8. Start CONSULT, and erase self-diagnosis result of "BRAKE" after record or print self-diagnosis results and freeze frame data (FFD).
9. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
10. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
11. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
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 "C1AC1" detected?

YES

GO TO STEP 13.

NO

INSPECTION END

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 ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
4. Repeat step 3 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
5. Start CONSULT and select "BRAKE" and "DATA MONITOR" according this order.
6. Check "MOTOR POWER SUPPLY" and "CONTROL MODULE POWER". Refer to REFERENCE VALUE .
Is the inspection result normal?

YES

GO TO STEP 14 .

NO

Replace the electrically-driven intelligent brake unit. Refer to REMOVAL AND INSTALLATION .

PERFORM SELF-DIAGNOSIS (6)

With CONSULT
1. Turn the ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
2. Repeat step 1 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
3. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
4. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
5. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
6. Start CONSULT, and erase self-diagnosis result of "BRAKE" after record or print self-diagnosis results and freeze frame data (FFD).
7. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
8. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
9. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
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 "C1AC1" detected?

YES

GO TO STEP 15.

NO

INSPECTION END

CHECK DATA MONITOR (2)

With CONSULT
1. Turn the ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
2. Repeat step 1 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
3. Start CONSULT and select "BRAKE" and "DATA MONITOR" according this order.
4. Check "CONTROL MODULE TEMP". Refer to REFERENCE VALUE .
"CONTROL MODULE TEMP" is 150 °C (302 °F) or more?

YES

GO TO STEP 16 .

NO

INSPECTION END

CHECK ENGINE ROOM

Check for any locations of abnormal heating around the electrically-driven intelligent brake unit.

Are there any heated locations?

YES

Perform diagnosis of the heated locations, and wait for the temperature to fall. GO TO STEP 17 .

NO

Replace the electrically-driven intelligent brake unit. Refer to REMOVAL AND INSTALLATION

PERFORM SELF-DIAGNOSIS (7)

With CONSULT
1. Turn the ignition switch OFF to ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
2. Repeat step 1 two times or more.
  CAUTION:
  Be sure to wait for 5 seconds or more after turning the ignition switch OFF.
3. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
4. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
5. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
6. Start CONSULT, and erase self-diagnosis result of "BRAKE" after record or print self-diagnosis results and freeze frame data (FFD).
7. Turn the ignition switch OFF and disconnect CONSULT from data link connector.
8. Get out of the vehicle, close all doors (including trunk lid), check that the map lamp is OFF, and wait for 3 minutes or more without opening these doors.
  CAUTION:
  Never operate the vehicle.
9. Turn the ignition switch ON without depressing the brake pedal.
  CAUTION:
  Never set the vehicle to READY/Never start the engine.
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 "C1AC1" detected?

YES

Replace the electrically-driven intelligent brake unit. Refer to REMOVAL AND INSTALLATION .

NO

INSPECTION END