How do you turn the radio on in Alfa Romeo 156 and why does it say CD?

To turn on the radio in an Alfa Romeo 156, follow these steps:

- Press the power button on the radio.

- The radio will turn on and display the current radio station.

- Rotate the tuning knob to select the desired radio station.

The reason why it says "CD" is that the radio is displaying a message indicating that it is in CD mode. This means the radio is set to play audio from a CD that has been inserted into the CD player. To switch to radio mode, press the "CD" button on the radio.