Hyundai Repair: Thank U (Hyundai Tape Problem), 2002 hyundai sonata, hyundai sonata

Question
I have 2002 Hyundai sonata the battery died and i had to replace it and i do not know why but once i got the new one the car started properly but the tape did not. when i tried to start the tape it asked me for a code but i had no idea so tried some codes but then after i tried some codes it showed me an error MSG. Why. please tell me why i do not have any entertainment in my car. Thank You Again!

Answer
Hyundai has used anti-theft radios, but only through about 1996 in the U.S., so I'm a little surprised that the radio in your 2002 Sonata is asking you for an anti-theft code.  

In any event, we can try to see if the radio code system is the same as is used in the earlier radios.  First turn the radio off.  Then, while holding the "4" button in, turn on the radio.  If the anti-theft feature is similar to the older radios, a series of lines and perhaps the number one should appear.  I'll need to know the positions of the lines in the display and whether the number 1 is present.  The number 1 will be on the left side of the display, and the lines will be displayed in positions in a 3 x 3 array.  You can give me the positions of the lines with a description something like "top row, center position."