Hi
Fitted R20 steering wheel into my MK6 (with the same 1K0.. CH steering module as MK5) and all buttons work but they wont illuminate. Yet.
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To get your buttons illuminate on MK5 you will need to swap the steering module from newer model 2010up. To make it easier I made myself wiring adapter so I can always remove it and put original module back.
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I test fitted it in my car and on
ady-uk 2005 MK5. All works as it should, buttons, illumination etc.
Also tested 3 or 4 MK7 and Rocco wheels with cruise buttons and non of them works with 1K0 or 5K0 modules. Only the one without cruise buttons works.
Thanks
Alex