GMC TERRAIN 2018 Owner's Manual page 6

Instrument Panel Storage
If equipped with storage behind the
radio, press and hold to open.
There is a USB port inside.
Press and hold again to close.
Keep the storage area closed when
not in use. See the owner's manual.
1. (Power)
2. MEDIA
Radio with CD
3. RADIO
4. or
Introduction 5
d