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, 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.

The BSI indicator may come on and the following DTCs may be stored even when the system is normal: 

B18A5: Left side BSI radar unit temperature high

B18A6: Right side BSI radar unit temperature high

B18A7: Left side BSI radar unit voltage input low

B18A8: Right side BSI radar unit voltage input low

B18A9: Left side BSI radar unit voltage input high

B18AA: Right side BSI radar unit voltage input high

B18B4: Left side BSI radar unit dirty

B18B5: Right side BSI radar unit dirty

B18BD: BSI control unit voltage input high

B18BE: BSI control unit voltage input low