Radio beeping noise

[Lucaio]

My radio has started to beep at me every few seconds when it's turned on. I have the tuner list radio, it may have something to do when I held down the SRC button and it went into some menu although I didn't change any of the settings there.
It only beeps when the radio is turned on, and it still beeps when I pause using the steering wheel controls.

Anyone have any idea what I have done and how to fix it?

 

[Lucaio]

Fixed.
If anyone gets a similar problem and wonders what to do....

Leave the radio on for a minute, then hold down 2 and 5 to get onto the code entry menu, then enter the radio code using the steering wheel controls (scrolly thing to change number, mode button for next), then hold down the mode button, select 2 for curve, hold mode button, select others, hold mode butter, set rear to on, hold mode button. And problem solved!