Data access method and data access apparatus for accessing data at on-vehicle information device

摘要

In a data access method for accessing data in an on-vehicle information device having an on-vehicle memory unit that allows data stored therein to be read out and overwritten by an external apparatus and an on-vehicle control unit that executes a data read and a data overwrite by controlling the on-vehicle memory unit, supplying power to the on-vehicle information device from the external apparatus when a power switch at the on-vehicle information device is in an OFF state, and reading out the data in the on-vehicle memory unit and overwriting the data through control implemented by the external apparatus.