On-Board Diagnostic System Description
WARNING: This page is about a different car, the 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
ECM diagnoses if there is any trouble in the cruise control system. When the ECM detects an abnormality in the cruise control system, it saves the area where such abnormality has occurred as a DTC in its memory but MIL does not light up. To read DTC, use SUZUKI scan tool referring to DTC CHECK .