mx5cartalk.com

You will need the key in at least the acc position and you will also have to push the on button on the unit Spiky (it may sound like an err derr statement, but it's often the err derrs that make it work).
Does your ariel still go up?

This link http://www.aus-cartalk.com/viewtopic.php?t=17588 may be helpful too.

well a few tips for the new headunit
you can install it yourself it isn't that hard (I did my own install) this way you save some money

but

if you get it installed by the people who sell you the headunit you will have better after sales service if anything goes wrong with it and some sellers will even void the warrany if they don't get to install it myself, not sure if that's leagal but it is life well for me at least
had a bit of trouble with rear RCA outputs went back to shop and was told whatever was wrong with it wasn't covered so i fixed it myself all good now just annoying that I was turned down before they even looked at it (problem was loose RCA on headunit due to the shallow NB radio slot)

yea so do I and I did

I hope this link helps:

http://www.ausrotary.com/viewtopic.php?t=121126