Problema con los sonidos de aviso de los radares

Hola buenas noches, quisiera comentaros un problema que me ha surgido esta tarde al instalar unos radares......Tengo un GO 930 con navcore 9702..Bien pues una vez puestos en la raiz del mapa, me pongo a configurarlos usando la bateria del Gps y despues de meter la distancia y elegir el sonido, resulta que no se oye el sonido del radar que seleciono.......Pero si hago lo mismo con el Gps enchufado a la electricidad de casa se oyen los sonidos que voy selecionando para cada radar...Es decir, si tengo el gps enchufado a la corriente, si se oyen los sonidos de aviso de los radares que voy selecionando, y si no esta enchufado y estoy usando la bateria del gps, no se oyen ninguno............Y si llevo el gps enchufado en el mechero si se oyen los avisos, pero si no lo llevo enchufado, no se oyennnn..........Por favor alguien me podria orientar para solucionar este problemilla nuevo.......Saludos y muchas gracias por vuestra atencion.....

DeviceName=TomTom GO 7000 TRUCK
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BuiltInColorScheme10=Asia
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BuiltInColorScheme12=Concordia
BuiltInColorScheme13=NewAnglia
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CurrentVoiceInfo=Carmen
CurrentMap=Iberia_1105_11752
CurrentMapVersion=1105.11752
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NrSupportedErrorTypes=138
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MapServerPatchDatVersion=105
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