B18C2

DTC Troubleshooting: B18C2

DTC B18C2:

Left BSI Alert Indicator Output 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 B18C2 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. Remove the door mirror cover Power Mirror Replacement.

6. Measure the resistance between left BSI alert indicator 2P connector terminal No. 1 and body ground. There should be less than 1.0 Ohms.





Is the resistance as specified?

YES -

Go to step 7.

NO -

Repair an open in the wire between the left BSI alert indicator and body ground (G405).�

7. Press the engine start/stop button to select the ON mode, and within 3 seconds measure the voltage between left BSI alert indicator 2P connector terminals No. 1 and No. 2.





Does the voltage remain between 12 V and 1 V for 3 seconds after pressing the engine start/stop button to select the ON mode, then go down to 0 V?

YES -

Replace the left BSI alert indicator Service and Repair.�

NO -

Go to step 8.

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

9. Disconnect the BSI control unit 16P connector.

10. Measure the resistance between left BSI alert indicator 2P connector terminal No. 2 and body ground. There should be an open circuit or at least 1 MOhms.





Is the resistance as specified?

YES -

Go to step 11.

NO -

Repair a short to ground in the wire between the BSI control unit and the left BSI alert indicator.�

11. Measure the resistance between BSI control unit 16P connector terminal No. 4 and left BSI alert indicator 2P connector terminal No. 2. There should be less than 1.0 Ohms.





Is the resistance as specified?

YES -

Go to step 12.

NO -

Repair an open in the wire between the BSI control unit and the left BSI alert indicator.�

12. Make sure the BSI control unit 16P connector is disconnected.

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

14. Measure the voltage between left BSI alert indicator 2P connector terminal No. 2 and body ground. There should be less than 0.2 V.





Is the voltage as specified?

YES -

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

NO -

Repair a short to power in the wire between the BSI control unit and the left BSI alert indicator. If the problem is still present, replace the left BSI alert indicator Service and Repair.�