Correction coefficients corresponding to parameters by which characteristic variation is caused are stored in a data memory of a second integrated circuit element in which driving open/close elements respectively connected in series to a plurality of inductive loads are integrated, and a first integrated circuit element that cooperates with the second integrated circuit element suppresses a current control error accompanying individual variation among circuit components and environmental temperature variation by reading present values of the parameters and combining the present values with the correction coefficients. The correction coefficients are calculated by an adjustment tool in a state where the second integrated circuit element is provided singly, and therefore correction data can be generated in relation to a plurality of temperature environments easily.