bump for '04 solution
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I have an 05 but I found this for your 04
Press on "Menu"
Press on "DVD"
Press on upper left corner of screen
Press on lower left corner of screen
Press on upper left corner of screen
Press on lower left corner of screen
Press on lower right corner of screen
Press on "Override" and hold until a beep is heard
Press "Back"
This resets each time the key is turned off.