on many cars that is possible, but we don't know which
unit is in THAT car. Yes it is possible to make an
adapter. you can not be sure that any adapter on E bay
will be compatible, in fact it might wind up shorting
out the radio or the car electrical system.
DIN wiring is not standard on any system and you are
better off buying an adapter that was made specifically
for the model of radio you have.
what model radio DO you have? That is where you
start.
DO NOT TRUST VENDORS ON E BAY WITH
YOUR CAR ELECTRICAL SYSTEM!!!!
Be very cautious of any item offered on E bay, you
might wind up with a cloud of smoke and melted
wiring. Very expensive to repair.
Now if you buy an aftermarket radio specifically
intended for that car, and it has RCA inputs for a CD,
you will be much safer.
OR buy the stock CD player from Hyundai.
another issue is the stock speakers which are rather
low quality and low wattage rating. You are going to
want to change those also. The speakers in my Hyundai
are rated 3 watts, those are the factory speakers.
CRUTCHFIELD at one time offered technical
advisers to find the exact model radio and adapter
or CD, amp that will fit a specific model car
without the confusion and short circuits. That's
a good way to go compared to buying (????) off
e bay. The technical service is free, and could save
you a huge headache.