Many a time's radio asks for the code after car battery is disconnected.
On some cases to retrieve the code its mentioned in manual or else car dealer is other option to get car radio code.
For more help on car radio problems, I suggest you to go through these troubleshooting links, these will help you: -----
Click the link below: ---
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http://schematicsdiagram.blogspot.com/2011/12/how-to-wire-new-radio-on-1990-toyota.html
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http://schematicsdiagram.blogspot.com/2011/12/radio-stereo-wiring-diagram-for-1991.html
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http://repairhelpcenter.blogspot.com/2011/11/how-to-remove-radio-on-acura-car-models.html
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http://schematicsdiagram.blogspot.com/2011/12/where-is-radio-fuse-located-on-2007.html
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http://howtobyme.blogspot.com/2011/12/how-to-reset-radio-code-after-car.html
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http://schematicsdiagram.blogspot.com/2011/12/can-car-radio-code-block-passkey-anti.html
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http://schematicsdiagram.blogspot.com/2011/12/after-market-stereo-wiring-for-1999.html
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http://schematicsdiagram.blogspot.com/2012/01/chevy-car-radio-doesnt-allow-to-switch.html
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http://repairhelpcenter.blogspot.com/2012/01/no-power-to-radio-on-2005-toyota-scion.html
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http://repairhelpcenter.blogspot.com/2012/01/lexus-rx330-radio-has-power-but-no.html
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http://technoanswers.blogspot.com/2012/01/radio-goes-on-and-off-while-driving.html
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http://technoanswers.blogspot.in/2012/02/lincoln-town-car-radio-stereo-wiring.html
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http://technoanswers.blogspot.in/2012/02/radio-wiring-diagram-for-1997-lincoln.html
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http://technoanswers.blogspot.in/2012/01/how-to-remove-cd-player-from-dash-on.html
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These details will help you thanks.
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