Power Supply and Ground Circuit

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure


1. CHECK ELECTRICALLY-DRIVEN BRAKE UNIT IGNITION POWER SUPPLY

1.Turn the ignition switch OFF.
2.Close all doors including the trunk lid, and wait outside of vehicle for 5 minutes or more.
3.Disconnect the electrically-driven intelligent brake unit harness connector.
4.Check voltage between the electrically-driven intelligent brake unit harness connector and ground.





5.Turn the ignition switch ON.

CAUTION:
Never set the vehicle to READY/Never start the engine.
6.Check voltage between the electrically-driven intelligent brake unit harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK ELECTRICALLY-DRIVEN BRAKE UNIT IGNITION POWER SUPPLY CIRCUIT

1.Turn the ignition switch OFF.
2.Close all doors including the trunk lid, and wait outside of vehicle for 5 minutes or more.
3.Check 10A fuse (#46).
4.Disconnect IPDM E/R harness connector.
5.Check continuity between electrically-driven intelligent brake unit harness connector and IPDM E/R harness connector.





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





Is the inspection result normal?
YES- Perform trouble diagnosis for ignition power supply. Ignition Power Supply.
NO- Repair or replace error-detected parts.

3. CHECK ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT 12V BATTERY POWER SUPPLY

1.Turn the ignition switch OFF.
2.Close all doors including the trunk lid, and wait outside of vehicle for 5 minutes or more.
3.Check voltage between the electrically-driven intelligent brake unit harness connector and ground.





4.Turn the ignition switch ON.

CAUTION:
Never set the vehicle to READY/Never start the engine.
5.Check voltage between the electrically-driven intelligent brake unit harness connector and ground.





Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 4.

4. CHECK ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT 12V BATTERY POWER SUPPLY CIRCUIT

1.Turn the ignition switch OFF.
2.Disconnect 12V battery cable to negative terminal. Removal and Installation.
3.Check 50A fusible link (#D).
4.Check continuity and for short circuit between electrically-driven intelligent brake unit harness connector terminal (1) and 50A fusible link (#D).
5.Check continuity and for short circuit between electrically-driven intelligent brake unit harness connector terminal (2) and 50A fusible link (#D).
6.Check 10A fuse (#65).
7.Check continuity and for short circuit between electrically-driven intelligent brake unit harness connector terminal (11) and 10A fuse (#65).
Is the inspection result normal?
YES- Perform diagnosis for 12V battery power supply. Battery Power Supply.
NO- Repair or replace error-detected parts.

5. CHECK BRAKE POWER SUPPLY BACKUP UNIT 12V BATTERY POWER SUPPLY

1.Turn the ignition switch OFF.
2.Close all doors including the trunk lid, and wait outside of vehicle for 5 minutes or more.
3.Check voltage between brake power supply backup unit harness connector and ground.





4.Turn the ignition switch ON.

CAUTION:
Never set the vehicle to READY/Never start the engine.
5.Check voltage between brake power supply backup unit harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 7.

6. CHECK BRAKE POWER SUPPLY BACKUP UNIT 12V BATTERY POWER SUPPLY CIRCUIT

1.Turn the ignition switch OFF.
2.Close all doors including the trunk lid, and wait outside of vehicle for 5 minutes or more.
3.Check 15A fuse (#66).
4.Check continuity and for short circuit between brake power supply backup unit harness connector terminal (3) and 15A fuse (#66).
Is the inspection result normal?
YES- Perform diagnosis for 12V battery power supply. Battery Power Supply.
NO- Repair or replace error-detected parts.

7. CHECK ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT GROUND

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





Is the inspection result normal?
YES- GO TO 8.
NO- Repair or replace error-detected parts.

8. CHECK BRAKE POWER SUPPLY BACKUP UNIT GROUND

Check continuity between brake power supply backup unit harness connector and ground.





Is the inspection result normal?
YES- GO TO 9.
NO- Repair or replace error-detected parts.

9. CHECK TERMINAL

- Check for failures in the pin terminals and connections of the electrically-driven intelligent brake unit harness connector.
- Check that there is no malfunction in pin terminal and connection of IPDM E/R harness connector.
- Check for failures of pin terminals and connections in brake power supply backup unit harness connector.
Is the inspection result normal?
YES- INSPECTION END
NO- Repair or replace error-detected parts.