'year make model' of the vehicle is needed in questions like this please?
Modern vehicle radios are controlled by the Body control Module (BCM) and are used for broadcasting warning beeps and indicator clickers. The beeps an be as innocuous as "do you know your radio is still on"? It can also be caused by your cellphone pinging local transmitters and receiving a confirmation back, or checking in for emails.
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Aug 26, 2010 - What causes a beeping noise to come over the radio speakers? How can it be made to stop? - Answered by a verified Mercedes Mechanic.
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Apr 6, 2019 - My speaker has suddenly began making a single sound every few seconds which sounds like a single busy signal on a phone. I have read the manual, ...
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Oct 26, 2022 - Press the AS button and hold depressed while turning the radio on. (after 3 secs you should hear a beep. Release the AS button. The display ...
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If this is with an analogue signal; FM/AM, check the aerial amplifier is working properly. Sometimes the rear windscreen heater is used as the aerial with an RF amplifier in series with the aerial lead.
No power means no/poor signal.