Alpine cva1014rb help please

[sline29]

hi all just purchased this unit from a friend,but having trouble getting it to work,tried it in me wifes polo,its works fine but nothing in audi
i have a 2005 audi a4 sline,with standard singledin concert headunit,non bose
i have purcahsed a autolead pc9 401 harness to connect it but still nothing,doesnt power up at all?ive fitted a few stereos in my time but this is totally bambozzoling me
something to do with canbus?
any help would be great guys!
if not im gona have to sell the alpine and just get an ipodinterface

 

[AndyMac]

Your A4 uses the CANBUS to tell the HU when the ignition is on, the Alpine expects a 12v feed when the ignition is on. So you need to either wire in an ignition on feed from the fusebox or just pair the red ignition on wire to the permanent 12v live yellow wire and turn the HU on/off manually.