How to mend Pioneer Deh-1900r

Unable to find my code. details are as follows, thanks for the help!!?

hi, making a new wiring harness (original missing ) for stereo cassette?

code for car audio?

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used cassette car stereo?

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GM0303M1437958 (SC 303 (C))?

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Error 11 When I insert a MP3 CD in my Pioner car music system?