Press the [SOURCE] button.
Press the button to switch modes in the following sequence:
FM/AM → CD (MP3/WMA/AAC)*2 → USB*1 → iPod*1 → AUX*3 → FM/AM···
*1 Cannot be selected if the corresponding device is not connected to the main unit.
*2 Not displayed if no disc is inserted.
*3 Cannot be selected if the AUX mode is not set to ON. For details, Switching the AUX mode on and off