此工程程序是只对丰田车型原车载音响的CDC协议的，可用于对原车载音响增加扩展功能，例如：给原车载音响增加读USB,SD卡功能。-This engineering program only Toyota models original car audio CDC protocol can be used to increase the extended functionality of the original car audio, for example: increase read USB, SD card function to the original car audio.