Thanks, I've read that one, problem is with item 6:

6. Locate audio and power cables in vehicle. Connect the three pin power & I-bus cable
to changer. For vehicles without DSP HiFi connect the 6 pin audio cable to changer. For
vehicles with DSP HiFi connect the single coax digital audio cable to the changei
(for DSP the 6 pin audio cable need not be connected).

I cannot locate the power/audio cables!