After searching Ebay and such, I found an wire harness for the premium sound system to work with the amplified factory unit. If you are installing a new deck for HD radio or an Ipod....the factory harness couldn't be found to work with the amplified system or the H290 radio.

Scosche has one that will work without having to bypass the amplifier system. It is listed for an 2006 Sonata system but has the proper connector and filter to make it work with aftermarket head unit. Part # HY06B

It has been a pain trying to find one to mate with aftermarket head units without having to cut into anything.

Also, if you are looking into a double din install kit they have one too. Part # HY1602B

Hope this helps someone from wasting time surfing....I know I have the past week.

Chris

If you had the time, since you know what the harness looks like, could you drop me an ebay link or find it on scosche's website that way i know what one i need cause the model number doesnt exist anymore :'c ty again for helping me figure that one out.

http://www.sjgreatdeals.com/sishy06b.html

trust me, this one says for '06 Hyundai and Kias...it will work on your 03...it is the same one I am using now.

Chris

This was the first link I found for the part #...just google it to find a better deal.