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Controlling Functions And Menu Selection Using The Steering Wheel Buttons

See:

Design and Function, audio module (AUM). Applies to S60, V70, V70XC/XC70 and S80
Design and Function, Road traffic information system (RTI). Applies to S60, V70, V70XC/XC70 and S80
Design and Function, engine management system
Design and Function, phone module (PHM).