Garmin G900X Pilot's Manual page 645

If a failure still exists, the following messages may provide insight as to the possible problem:
Message
CHECK ANTENNA
UPDATING
NO SIGNAL
LOADING
OFF AIR
---
WEATHER DATA LINK FAILURE
ACTIVATION REQUIRED
190-00726-00 Rev. J
Message Location
XM Radio Page - active channel field
XM Radio Page - active channel field
XM Radio Page - active channel field
Weather Datalink Page - center of page
XM Radio Page - active channel field
XM Radio Page - active channel field
XM Radio Page - active channel field
Weather Datalink Page - center of page
Weather Datalink Page - center of page SiriusXM subscription is not activated
Table 8-7 GDL 69/69A Data Link Receiver Error Messages
Garmin G900X Pilot's Guide
ADDITIONAL FEATURES
Description
Data Link Receiver antenna error; service required
Data Link Receiver updating encryption code
Loss of signal; signal strength too low for receiver
Acquiring channel audio or information
Channel not in service
Missing channel information
No communication from Data Link Receiver
within last 5 minutes
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