| 摘要 |
PROBLEM TO BE SOLVED: To provide an on-vehicle electronic control device that can rewrite a control program in a short time without increasing facility costs.SOLUTION: A plurality of electronic control devices 100 rewrite a control program by going through a connection step of being connected with one writing device 11 via the same communication bus 12 and a transmission step of the writing device 11 transmitting a control program only once to all the electronic control devices 100 connected with the communication bus 12 and the control program being simultaneously written in a rewriting region in a ROM 140 of a microcomputer 110 of each of the electronic control devices.SELECTED DRAWING: Figure 1 |
