B18BC

DTC Troubleshooting: B18BC

DTC B18BC:

BSI Radar Units Communication Error

1. Clear the DTCs with the HDS.

2. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.

3. Check for DTCs with the HDS.

Is DTC B18BC indicated?

YES -

Go to step 4.

NO -

Intermittent failure, the system is OK at this time.�

4. Press the engine start/stop button to select the OFF mode.

5. Disconnect the left BSI radar unit 6P connector.

6. Disconnect the right BSI radar unit 6P connector.

7. Disconnect the BSI control unit 16P connector.

8. Check for continuity between BSI control unit 16P connector terminal No. 3 and body ground.





Is there continuity?

YES -

Repair a short to ground in the wire between the BSI control unit and the branch of the BSI-CAN line (BSI-CAN H).�

NO -

Go to step 9.

9. Check for continuity between BSI control unit 16P connector terminals No. 2 and No. 3.





Is there continuity?

YES -

Repair a short in the wire between the BSI-CAN H line and the BSI-CAN L line.�

NO -

Go to step 10.

10. Press the engine start/stop button to select the ON mode.

11. Measure the voltage between BSI control unit 16P connector terminal No. 2 and body ground. There should be less than 0.2 V.





Is the voltage as specified?

YES -

Go to step 12.

NO -

Repair a short to power in the wire between the BSI control unit and the branch of the BSI-CAN line (BSI-CAN L).�

12. Press the engine start/stop button to select the OFF mode.

13. Reconnect the BSI control unit 16P connector.

14. Measure the resistance between BSI control unit 16P connector terminals No. 2 and No. 3. There should be an open circuit or at least 1 MOhms.





Is the resistance as specified?

YES -

Go to step 15.

NO -

Replace the BSI control unit BSI Control Unit Removal/Installation.�

15. Reconnect the right BSI radar unit 6P connector.

16. Press the engine start/stop button to select the ON mode.

17. Clear the DTCs with the HDS.

18. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.

19. Check for DTCs with the HDS.

Is DTC B18BC indicated?

YES -

Replace the right BSI radar unit BSI Radar Unit Removal/Installation.�

NO -

Replace the left BSI radar unit BSI Radar Unit Removal/Installation.�