This weekend I replaced the power antenna on my 2003 Sonata with the Metra 44-PW22 aftermarket unit (about $35 on eBay). I had a difficult time due to the fact that while I was trying to figure out which wires needed to be spliced, I blew a fuse and didn't even realize it. So, in case anyone else is tackling this, I didn't want you to make the same mistakes I did. Specifically, the Sonata (at least the 2003) is wired in the following way:
Black=Ground (connect the black ground wire from the Metra here)
Green=Switched Power (connect the blue wire from the Metra here)
Yellow w/ Stripe=Constant 12v Power (connect the red wire from the Metra here)
If this doesn't work, check that the fuse labeled d.light in the cabin fuse box isn't blown. Hope this helps someone. Also, you'll have to be a little creative (drill a couple holes) to use the original mounting hardware from the old antenna, as the Metra is about two inches shorter than the Hyundai factory unit.
Black=Ground (connect the black ground wire from the Metra here)
Green=Switched Power (connect the blue wire from the Metra here)
Yellow w/ Stripe=Constant 12v Power (connect the red wire from the Metra here)
If this doesn't work, check that the fuse labeled d.light in the cabin fuse box isn't blown. Hope this helps someone. Also, you'll have to be a little creative (drill a couple holes) to use the original mounting hardware from the old antenna, as the Metra is about two inches shorter than the Hyundai factory unit.