CAN

HV BAT BRANCH LINE CIRCUIT

Diagnosis Procedure


WARNING:
- Because hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance.
- Be sure to remove the service plug in order to shut off the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
- Be sure to put the removed service plug in your pocket and carry it with you so that another person does not accidentally connect it while work is in progress.
- Be sure to wear insulating protective equipment consisting of glove, shoes and glasses before beginning work on the high voltage system.
- Clearly identify the persons responsible for high voltage work and ensure that other persons do not touch the vehicle. When not working, cover high voltage parts with an insulating cover sheet or similar item to prevent other persons from contacting them.
- High Voltage Precautions.

CAUTION:
There is the possibility of a malfunction occurring if the vehicle is changed to READY status while the service plug is removed. Therefore do not change the vehicle to READY status unless instructed to do so in the Service Manual.

1. CHECK CONNECTOR

1.Turn the ignition switch OFF.
2.Disconnect the 12V battery cable from the negative terminal.
3.Check the terminals and connectors of the Li-ion battery for damage, bend and loose connection (unit side and connector side).
Is the inspection result normal?
YES- GO TO 2.
NO- Repair the terminal and connector.

2. CHECK HARNESS FOR OPEN CIRCUIT

1.Disconnect the connector of Li-ion battery.
2.Check the resistance between the Li-ion battery harness connector terminals.





Is the measurement value within the specification?
YES- GO TO 3.
NO- Replace the body harness.

3. PRECONDITIONING


WARNING:
Shut off high voltage circuit. How to Cut Off High Voltage.
Check voltage in high voltage circuit. (Check that condenser are discharged.)
1.Remove trunk finisher front. Trunk Room Trim.





2.Remove harness cover (1).









3.Measure voltage between high voltage harness terminals.









CAUTION:
For voltage measurements, use a tester which can measure to 500 V or higher.
- GO TO 4.

4. CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the Li-ion battery controller. Li-Ion Battery Controller Diagnosis Procedure.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair the power supply and the ground circuit.

5. CHECK HARNESS FOR OPEN CIRCUIT

1.Remove Li-ion battery controller. Li-Ion Battery Controller Disassembly and Assembly.
2.Check the continuity between vehicle communication harness (harness between Li-ion battery harness connector side and Li-ion battery controller side) connector terminals. Circuit Diagram.





Is the measurement value within the specification?
YES (Present error)-Replace the Li-ion battery controller. Li-Ion Battery Controller Disassembly and Assembly.
YES (Past error)-Error was detected in the Li-ion battery controller branch line.
NO- Repair the vehicle communication harness.