| 摘要 |
A rewrite control apparatus capable of saving data which should not be reset, and rewriting a program of a large capacity on a memory of a small capacity. For this purpose, a data area ( 23 b) for storing vehicle condition data is provided in a storage medium ( 23 ) of an onboard controller ( 35 ). When rewriting an onboard program, the apparatus writes the vehicle condition data into a storage area ( 23 a) different from the data area, or a storage medium different from the storage medium ( 23 ) and save it, and executes the rewrite, and after finishing the rewrite, it writes the saved vehicle condition data back into the data area.
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