Sony CDX-GT56UI Operating Instructions (CDX-GT56UI) Operating Instructions Manual page 28

CHK TUNR (Check Tuner)
 The SiriusXM Connect tuner is not
functioning properly.
– Disconnect the SiriusXM Connect tuner,
and connect it again.
CHEK ANT (Check Antenna)
 The antenna (aerial) is not being used
properly.
– Make sure the antenna (aerial) is connected
and being used properly.
CODE ERROR
 Passcode inputs failed.
NOSIGNAL
 The service is stopped due to a signal
interruption.
SUB UPDT (Subscription Updated),
PRESS SELECT
 Your subscription has been updated.
– Press the select button.
If these solutions do not help improve the
situation, consult your nearest Sony dealer.
If you take the unit to be repaired because of
CD playback trouble, bring the disc that was
used at the time the problem began.
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