CD player driving me up the wall

Does any electrically minded person have an idea to help me out? Recently fitted a new Sony CD player to the fourby, every time i switch the ignition off the unit makes several beeps through the speakers to tell me i've turned the power off!

Does anyone have an idea on how to stop these beeps? It's driving me up the wall. I don't need a cd player to tell me when i've turned the ignition off. It does it even if i haven't even touched the cd player. Have contacted Sony and pressed every button on the machine but it still beeps.

All i can think of is fit a switch through the power wire to isolate it from everything else so i can regulate exactly when the unit is on or off.

Any other ideas appreciated.

Thanks
Barnesy