How to Troubleshoot DTCs

Check the DTCs with the HDS.

Before troubleshooting, check and note these items:

• Ask the client about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting.
• If the symptom does not appear and the BSI indicator does not come on during the test-drive the vehicle, but troubleshooting is done based on the DTC, check for poor connections or loose terminals at all connectors related to the circuit that you are troubleshooting.
• After the troubleshooting or repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions as when the DTC was originally set. Make sure the BSI indicator does not come on.
• The BSI system sometimes stops control because of the environment (weather, road conditions, driving conditions, etc.). A DTC may be stored in these cases.

Some DTCs may be stored even when the system is OK. For example, the BSI indicator may come on with one or more of these DTCs: 

B18A5: Left BSI Radar Unit Temperature High

B18A6: Right BSI Radar Unit Temperature High

B18A7: Left BSI Radar Unit Voltage Input Low

B18A8: Right BSI Radar Unit Voltage Input Low

B18A9: Left BSI Radar Unit Voltage Input High

B18AA: Right BSI Radar Unit Voltage Input High

B18B4: Left BSI Radar Unit Dirty

B18B5: Right BSI Radar Unit Dirty

B18BD: BSI Control Unit Voltage Input High

B18BE: BSI Control Unit Voltage Input Low