DIAGNOSIS
1. Using scan tool (M.U.T.-III), diagnose the CAN bus line. [after turning the forced power supply output to "IG-ON" using the scan tool (M.U.T.-III)]
2. KOS-ECU diagnostic trouble code check [after turning the forced power supply output to "IG-ON" using the scan tool (M.U.T.-III)]
3. OSS-ECU diagnostic trouble code recheck