Try this:
> Disconnect the battery cables: Negative {black} cable first, then
Positive{red}.
> Touch and hold the metal ends of the cables together (hold together
so they make constant contact) for at least 30 seconds.
> Reconnect cables to battery: Positive first, then Negative.
> Then try entering the code.
Sometimes the radio will lock (especially if the code has been typed in
wrong several times) and this is a way to manually unlock it.
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