VEHICLE ELECTRONIC CONTROL SYSTEM, VEHICLE MASTER DEVICE, REWRITING INSTRUCTION METHOD BY SPECIFIC MODE, AND REWRITING INSTRUCTION PROGRAM BY SPECIFIC MODE

摘要

In a vehicle electronic control system (1), an ECU (19) rewrites a program by writing update data received from a master device (11) into non-volatile memory, and incomplete provisional software is written into a write area of the update data in the non-volatile memory. The master device includes: a specific mode determination unit (95a) that determines whether or not a specific mode is set; and a rewriting instruction unit (95b) that instructs the ECU to write the update data by the specific mode when the specific mode determination unit determines that the specific mode is set.