Subaru AUDIO VIDEO & NAVIGATION SYSTEM Owner's Manual page 76

Reference
■
USB Mode
Message
Don't remove the storage device until
scanning is finished (PND)
No songs found (PND)
ERR (Sub-display)
External USB device is not supported (PND)
ERR (Sub-display)
■
iPod Mode
Message
This device cannot be connected in this way
- use a different cable (PND)
ERR (Sub-display)
READING (PND)
No songs found (PND)
ERR (Sub-display)
No videos found (PND)
ERR (Sub-display)
No songs or videos found (PND)
ERR (Sub-display)
Unable connect to iPod (PND)
ERR (Sub-display)
Causes
This machine is currently reading USB data.
The USB memory does not include any supported audio
files.
Communication or play-back error
Causes
The iPod has been connected to the USB port.
This machine is currently detecting iPod data.
The iPod include no tracks.
The iPod contains no video.
The iPod contains neither tracks nor video.
A communication error, playback error, iPod software
incompatibility, or control error occurred.
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Remedial action
Wait for a brief period.
Import tracks onto the USB memory to play them.
Wait until the error is corrected, or change the mode.
Remedial action
Connect the iPod to the iPod dock cable instead of the
USB port.
Wait for a brief period.
Import tracks to the iPod to play them.
Import a video file for the iPod to play.
Import a track or video file for the iPod to play.
Connect a playable iPod.