The radio is used to adjust the vehicle's chime level. To change the volume level of the chime, press and hold pushbutton 6 with the ignition on and the radio power off. The volume level changes from the normal level to loud, and LOUD CHIME appears on the radio display. To change back to the default or normal setting, press and hold pushbutton 6 again. The volume level changes from the loud level to normal, and NORMAL CHIME appears on the radio display. Removing the radio and not replacing it with a factory radio or chime module disables vehicle chimes.