You'll probably find there's also a connector near that aux in on the back for controlling a CD changer..
Autoleads probably make a CD changer emulator for it. They do for my Sony HU.
Thanks, silly JVC, have to make it user unfriendly

. Oh well guess I'll stick to USB and FM transmitters ( in the case of my phone) unless these emulators are really cheap or there's another way.
It it doesn't think there is an attached CD changer it will never listen to the line-in for it
Hmmm, the cd changer plug is a 4 pin plug iirc, would it be possible to fool the HU that something is plugged in to the AUX port by short circuiting 2 of the pins ( not a clue which of the 4 though

) ?
EDIT:
The manual of my jvc radio says it supports an ipod, I have no clue how to get that working though

. I tried plugging in the ipod to the aux with a 3.5mm cable but I just cant select the source.
The manual says 3 things:
Check the cable and connection.
Recharge the battery.
Update the firmware.
How would I go about updating my HU's firmware

?
EDIT2:
Apparently I need a ''KS-PD100'' converter. Bloody morons, what's wrong with a bloody universal 3.5 mm TRS cable rather than messing around with some ****ing Ipod plug

? Why did they put it there if you can't under it with any universal audio device?
IF anyone knows of any ''hack'' eg. what poles to short circuit so it picks up something from the aux port, I'd be grateful.
Edit3:
Hmmm, I need a JVC KS-U58 adapter for 3.5 mm things, I wonder why on earth they put a 3.5mm port on the back if you need an adapter

.
The only issue is, this adapter costs 45 bloody euro's, I can nearly buy a new HU for that

.