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Honda has an anti theft device installed in the radio. If someone steals your radio it won't work for them when they power it back up until they put in the proper "radio code". That is what you are doing, you are switching off the power to the radio and when you restore or repower the radio, you need to enter the radio code into the radio and it will then work. If you can't find the radio code attached to your owners manual you can take your VIN number to any Honda dealer and they can look it up on their computer. Write it down for future reference because every time you turn that switch OFF and back ON you will need to enter that code again. Same thing if you disconnect the battery for any reason. So find the code or make a trip to the Honda dealer.