I'm not sure how it happened, but after washing my car, when I turn on my radio it says "code". I know I have to input the radio code to get it to work, and I have the code. However, when I type it in, the unit just beeps and "CODE" remains on the screen. I looked in my manual, and it says I get 3 tries to input the code, then it wont let me try again until the radio has been on for an hour. Does that mean I have to have my car on for an hour straight, or just keep the unit on every time I drive, and it will keep adding up minutes?