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I drive a 2009 Kia Rio Hatchback. A few days ago the car battery was replaced and I can't get the K100R radio to work.

Last time my car lost power and was jump-started, I was able to input a 4-digit code to unlock the radio (so I know the code is correct). This time, it won't accept the code and just displays "CD1".

I don't know what this means. What can I do to make it work again?

  • Hi can I ask what your codes were? I'm having trouble finding mine after changing my battery – user7463 Nov 9 '14 at 9:02
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Finally managed to solve this problem. There were two, different 4-digit codes: one on the back of the manual, and another on a separate card. The 4-digit code on the card was the correct one for the radio.

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