Error message with CD changer
E35 means that the CD cartridge is empty.
E30 means that the CD label is wrong side up
E34 means that the changer door is open
E33 is a changer communications error
The changer door has two tabs on them to tell the changer when the door is open and closed. If one of them is broken off then you would get this error even it the door is shut. I had this issue and ordered a new door from Pioneer. If your car is under warrantee get it replaced.

