Subaru Outback Manuals 2017 Outback Owner's Manual | Page 287

5-36 Audio/Audio set Experience Cause . The “HD Channel is unavailable” caution message appears when digital reception is not . possible. When the system determined that the SPS . station could not be received while receiving a digital broadcast and SPS station. . When the SPS broadcast is ended (stopped) by the radio station while receiving SPS. Action When the status is changed to acquiring digital data because the reception condition of SPS station has improved. When the received station is changed.