Hi everyone,

What the easy and the best way to use my Radio Unit (AUX) it's 03 LT 6CDs.

What do you mean? Do you want to use the AUX button to control another device such as an Ipod?

yes or any RCA connection.

if you still have tape you can hook up a tape player :)

if you still have tape you can hook up a tape player :)

No tape only 6CDs

will this help?
http://www.cardomain.com/item/PIEGM9AUX?vq_id=none

but it says: Not compatible with in-dash slave 6-disc changer

that would make since you already have 6 disk player built in.

Maybe you could hook up a DVD player

You can do it. You need an adapter that converts the input socket on the back of the stereo (originally designed for a tape deck or external cd changer) to an RCA jack. I believe the part number is GM-AUX. I got mine from Tweeter for like $50, and allows you to install any other device with RCA jacks and also gives you an input for your changer/tape deck. I use mine for my Ipod with the help of a RCA to headphone wire from Radio Shack.

Is there any instructions on the internet on how to do this?

Not that I know of. If you buy the adapter, it comes with instructions. Pretty simple, it just plugs right in.

do you have a link to the adapter or what i should search for?

http://www.logjamelectronics.com/piegm9aux.html
http://www.autotoys.com/x/catalog/GM_AUX_ADAPTER_2003_12PIN_FEED_AUX_SOUND_INTO_YOUR _CAR_OR_TRUC_p_2521.html
http://www.audioallies.com/GetItem.asp?Item=GMAUX-9-OB

I got mine at Tweeter for $50.