KIA Picanto with Hyundai stereo

[Oozoid]

The Hyundai stereo in my Kia Picanto has what appears to be a standard DIN connection block, but the illumination input is on A3. The normal illumination input (A6) is grounded in the loom but it seems to make no difference whether it is connected to pos or neg or nothing.  Also, A4 and A7 are reversed (like VW and Opel).  (I tried to add this note to the ISO 10487 page using the edit function but I could see no way to submit the changes.)