Does the radio . . .
. . display "wait" after you enter the correct code?? If so, in addition to indicating it didn't like the code that was entered, it also means it's 'dead'. How and why that happened, I can't tell you but have seen a number of radios that react the same way.
In addition, for my radio, you must press the "SC" button after you enter the codes in order to 'enter' the code into the radio. If not, it just sits there.
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Regards . . . . JimF
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'94 S500 Cpe
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