I have no idea about this, because I bought my Corsa without the CD30, but a brief Google brought me this:
http://www.all-carsonline.co.uk/forums/ ... head-unit/It seems you'll need a converter of sorts.
Best of luck OPC

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Daily Lady: 2008 Yamaha YZF R6 - Hannah
Project: 2005 Corsa C 1.4i Club - Charlotte
"Just a 1400 with a loud exhaust and a cone filter"

Build/Banter thread :
viewtopic.php?f=30&t=26607Ex Daily Lady: 2014 KTM Duke 390 - Lady Katlin (RIP)
Ex Adrenaline Rush: 1997 Suzuki GSX-R 750 SRAD
Ex Daily: 1992 VW Fox 1600