On-Board Diagnostic System Description
WARNING: This page is about a different car, the 2010 Suzuki Kizashi. However, it is still accessible from the selected car via links, so may be relevant.
ECM diagnoses if there is any trouble in cruise control system. When ECM detects an abnormality in cruise control system, it saves the area where such abnormality has occurred as a DTC in its memory, but MIL does not light up. Read DTC using SUZUKI scan tool referring to DTC CHECK .