B18A7

DTC Troubleshooting: B18A7

DTC B18A7:

Left BSI Radar Unit Voltage Input Low

1. Clear the DTCs with the HDS.

2. Press the engine start/stop button to select the ON mode, then wait for 20 seconds.

3. Check for DTCs with the HDS.

Is DTC B18A7 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. Check the connection at the left BSI radar unit 6P connector.

Is the connection OK?

YES -

Go to step 6.

NO -

Repair the poor connection, and retest.�

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

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

8. Measure the voltage between left BSI radar unit 6P connector terminals No. 2 and No. 5. There should be battery voltage.





Is there battery voltage?

YES -

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

NO -

Go to step 9.

9. Measure the voltage between left BSI radar unit 6P connector terminal No.2 and body ground. There should be battery voltage.





Is there battery voltage?

YES -

Repair an open in the wire between the left BSI radar unit 6P connector and G701.�

NO -

Repair an open in the wire between the driver's under-dash fuse/relay box and the left BSI radar unit.�