To reprogram the radio there is 4 digit code. That code has to be inserted, once these code is inserted, your car radio will get into its actual setting where you can set/select your radio setting.
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: ---
----- Cigarette lighter, Remote central locking, and Radio stopped working http://whoisbyme.blogspot.in/2012/07/cigarette-lighter-remote-central.html
------- VW passat radio off safe mode? VW radio CODE? http://schematicsdiagram.blogspot.in/2012/03/vw-passat-radio-off-safe-mode-vw-radio.html
------------- How to wire new Radio on 1990 Toyota Celica?
http://schematicsdiagram.blogspot.com/2011/12/how-to-wire-new-radio-on-1990-toyota.html
-------------- Radio Stereo Wiring Diagram for 1991 Chevy 1500?
http://schematicsdiagram.blogspot.com/2011/12/radio-stereo-wiring-diagram-for-1991.html
------------------ How to remove radio on Acura Car models?
http://repairhelpcenter.blogspot.com/2011/11/how-to-remove-radio-on-acura-car-models.html
--------------- Where is Radio Fuse located on 2007 Dodge charger?
http://schematicsdiagram.blogspot.com/2011/12/where-is-radio-fuse-located-on-2007.html
------------- How to reset Radio code after car battery is died?
http://howtobyme.blogspot.com/2011/12/how-to-reset-radio-code-after-car.html
------------- Can car radio code block Passkey anti theft system ?
http://schematicsdiagram.blogspot.com/2011/12/can-car-radio-code-block-passkey-anti.html
---------- After Market Stereo wiring for 1999 Chevrolet Silverado 1500?
http://schematicsdiagram.blogspot.com/2011/12/after-market-stereo-wiring-for-1999.html
--------- Chevy car radio doesn't allow to switch to the XM Band to get the radio ID?
http://schematicsdiagram.blogspot.com/2012/01/chevy-car-radio-doesnt-allow-to-switch.html
------- No power to radio on 2005 Toyota Scion Xb?
http://repairhelpcenter.blogspot.com/2012/01/no-power-to-radio-on-2005-toyota-scion.html
--------- Lexus rx330 Radio has power but no sound?
http://repairhelpcenter.blogspot.com/2012/01/lexus-rx330-radio-has-power-but-no.html
------- Radio goes ON and OFF while driving?
http://technoanswers.blogspot.com/2012/01/radio-goes-on-and-off-while-driving.html
------ Lincoln Town Car Radio stereo wiring?
http://technoanswers.blogspot.in/2012/02/lincoln-town-car-radio-stereo-wiring.html
------ Radio wiring diagram for 1997 Lincoln Town Car?
http://technoanswers.blogspot.in/2012/02/radio-wiring-diagram-for-1997-lincoln.html
---- How to remove cd player from dash on 2003 Lincoln Aviator
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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