I have a 2008 Vectra Life 1.9CDTI with 70000 Miles on the clock. For a few weeks now the audible sound from the Indicators is not present. They are working fine and there are no fuses blown. Could I or someone else have turned it off unknowingly with the Radio controls etc. Does anyone know how to fix the problem. Can someone clarify where the Flasher unit is as it is not indicated on the Handbook. Thanks.