2004 Mazda MPV Owner's Manual - Page 216

Interior Comfort Audio System M Error 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 CHECK MD Cause MD is inserted upside down Solution Insert the MD properly. If the error indication does not disappear, consult an Authorized Mazda Dealer Insert another MD properly. If the error indication does not disappear, consult an Authorized Mazda Dealer Insert the CD properly. If the error indication does not disappear, consult an Authorized Mazda Dealer Check the CD for scratches or soiling CHECK MD MD is defective CHECK CD CHECK CD CD is inserted upside down CD is defective 6-37