Mazda 6 2006 Owner's Manual page 214

Interior Comfort
Audio System
qError Indications
If you see an error indication on the display, find the cause in the chart. If you cannot clear
the error indication, take the vehicle to an Authorized Mazda Dealer.
Indication
CD is inserted upside down
CHECK CD
CD is defective
6-34
Cause Solution
Insert the CD properly. If the error indication
does not disappear, consult an Authorized Mazda
Dealer
Insert another CD properly. If the error indication
does not disappear, consult an Authorized Mazda
Dealer