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Once power has been restored to the radio, the correct 4-digit radio code must be entered. This is a security feature to prevent radios from being stolen. The code is provided to the original owner and should also be in the dealerships' records. I also believe that if the incorrect code is entered too many times in succession, the system will lock up and not accept any input until a predetermined time has elapsed.

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Q: How do you reset the radio of a s40 Volvo after the battery has been changed?
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