Radio not working

Having disconnected the battery interrupts the current flow to the radio like it was stolen. As a theft deterrent feature, a four digit code has to be entered into the radio to activate it. Check your owner's manual for how that is done. There should also be a card that lists this passcode. If not, the dealer can help for a fee. Sometimes the code will be #0000 if no owner before you entered a code.

How do you enter the code of the radio has no power?

Hi. Can you please indicate how I can enter the code, if the radio has no power?