First make sure the CD cable is connected in the back of the head unit.
If that end appears OK, check that power is available at that end and the far (changer) end.
There may be a fuse for the changer as well.
There are two +12V power circuits in the cable to the CD changer, one is always on (so you can load/eject CDs) and one is probably only on when the head unit is on.
Not sure if your head unit has a label showing the pins on the connector, but it's probably the same as an RNS-D for that connector and their layout can be found easily enough online.
IIRC it's an 8-pin connector with 3 parallel rows of pins - 3,2,3. The +12V pins are the central ones in the rows of 3, though which way round I don't recall.
Easy enough to test with a multimeter.
Somewhere I have the layout of the round connector at the changer end, will dig it out if you need it. Edit: Attached! 
One slightly odd thing I discovered is that the documentation I found for that plug has the live/switched 12V connectors the wrong way round.
I'm also not 100% sure which way round that pin layout is, i.e. looking at the end of the loom or the plug on the CD changer itself.
But test it with a multimeter and you'll soon find out if there's +12v anywhere. 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 4th November 2018 at 12:48 PM.
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