A control apparatus for vehicles including a first vehicle compatible with an airbag-linked emergency and a second vehicle incompatible with the airbag-linked emergency is provided. The control apparatus includes: a receiver section for receiving an airbag signal from an airbag apparatus; an abnormality determination section for determining that the airbag apparatus is abnormal when the receiver section does not receive the airbag signal from the airbag apparatus; and a control section for activating the abnormality determination section when the control apparatus is mounted to the first vehicle, and for deactivating the abnormality determination section when the control apparatus is mounted to the second vehicle.