Subaru 2015 BRZ Owner's Manual page 318

Message
In HD radio mode
iPod full.
HD Radio tags cannot be stored.
No HD Radio signal available.
Storing the HD Radio tag failed.
Storing HD Radio tag information. Please wait...
The maximum of 50 HD Radio tags have been stored.
Please connect your iPod to transfer these tags
before storing more.
In XM mode
Check Antenna.
Check XM Tuner.
No Signal.
Channel Off Air.
Channel Unavailable.
Channel Unauthorized.
This is not a valid channel.
Incorrect code. Please try again.
Cause
There is no space remaining in the iPod memory.
The HD radio reception is poor.
Failed to save the tag information.
Cannot save the tag information because of an error.
Cannot save the tag information because the
maximum number of tags that can be saved in the
unit has been reached.
The XM antenna has disconnected.
The XM tuner has disconnected.
Displayed when the XM satellite radio signal is lost
(while accessing).
Displayed when the tuned XM channel is not currently
broadcasting.
Displayed when the tuned XM channel cannot be
received.
Displayed when you are not authorized to receive the
tuned XM channel, or while the code is being updated.
Displayed when the channel does not exist.
The parental lock code is incorrect.
Action
Connect an iPod with space remaining in its memory.
Try to receive the signal again in a location free from
obstructions.
Acquire the tag information again.
Acquire the tag information again.
Connect an iPod and transfer the tag information that
is saved in the unit to the iPod.
Check the connection of the XM antenna.
Check the connection of the XM tuner.
Try to receive the signal again in a location free from
obstructions.
Select a channel that is currently broadcasting.
Select a channel that can be received.
Select a channel that can be received.
Select a channel that can be received.
Enter the correct number.
Reference
Other 317