What does the SCAN button in a car mean?

[MacNadia]

Car SCAN button refers to scanning, which means searching for radio stations and then stopping to listen to the current station. Most car electronic screens have a SCAN function. When pressed in CD playback mode, the display will show "SCAN," and the music will start scanning from the next track of the currently playing song, playing a few seconds of each track before moving to the next one in a loop. When the user hears a track they like and presses the button again, the audio system will start playing from that track. Other CD buttons in the car include: MUTE for muting, MODE for mode selection, AMS for speed-sensitive volume, VOL for volume control, BAND for channel selection, SEL for selection, TUNE for sound effect selection, INT for preview, and RPT for repeat playback.