One problem related to sun roof has been reported for the 2003 Saturn ION. The most recently reported issues are listed below.
Interior roof around sun roof - very loss and wires are exposed. Dealership was notified when vehicle was purchased and failed to fix issue. Possible issue with wires exposed to getting wet. Ceiling has started to hang lower because the material/glue holding it in place is not working right. Possible replacement of ceiling should be done but company has not.