An electronic control unit for a vehicle includes a nonvolatile memory that is capable of erasing and writing data electrically, and capable of receiving a program to be written into the nonvolatile memory in units of a predetermined size by means of communication using a communication buffer. A use rate of the W sub-pixels is changed depending on whether or not a person is present within the predetermined range. A piston seal is provided in a circumferential groove formed in the cylinder body, which has an inner circumferential surface thereof in slidable contact with the piston and is capable of sealingly disconnecting the supply passage and the pressure chamber. Thus, the proposed flex-rigid printed wiring board is excellent in connection reliability, permitting to prevent the base material from being easily deformed near the bending portion, conductor circuit from being broken and the flexible substrate from being waved. The third upper mill is disposed above the window mill at a distance measuring approximately one-hundred twenty to one-hundred thirty percent of the length of a ramp of a whipstock for guiding the mills. In one embodiment, the present invention is a jack having multiple printed circuit boards, wherein each circuit board is used for connection to a particular style of a plug.