Most radios have a security code that must be entered into the radio before the battery is disconnected. In the event that the code was not entered or was not available, the security system will lock the radio so it won't work. It is an antitheft feature. If you have the owners manual, it should have a toll free number you can call to get assistance in aquiring a new code to unlock the radio. You can also call a dealership and they can assist you.
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