Just found this forum, loads of great info.
I have a problem with the CD30 in my 05 SXI.
About 3 months ago the battery was completly flat one morning, jumped off ok but did it again next day. Noticed the display was very bright showing 'EXTERN IN'. Short term removed the fuse and all is ok, replaced the fuse and ok for a few days then same again.
No pattern to it but it drains the battery when it happens which is obviously no good and driving without tunes is no good either. Ive had the car from approx 3 months old and NEVER had anything plugged into the CD30 (parret etc).