is it a cd30 or cd30 mp3 you are using?
if it is, then it was not possible to have that combination from factory, so they never fully tested them together. As such there are some incompatibilities with the cd30 range and CIDs.
For full functionallity you should need a cdc40 or CD70.
CIDs aren't that common on the corsa so i'm basing this on the astra.
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