No steering control wire?

Demonic69

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Hi all
First post... First Audi!
Got a 2003 A4 2.5 cab and wanted a decent, modern stereo. Put in a Sony, fiddled and got that working no problem. Bought a steering control adapter and couldn't get it to work, checked the loom and there's no wire where there should be! Are they using CAN bus again or am I missing something?
The steering wheel has 6 buttons, 3 each side.
Cheers
Dean