How do you stop the beeping sound on Pioneer DEH-P20 car stereo when turn engine off?

1. Press and hold the "FUNC" button on the stereo for at least two seconds.

2. Rotate the "VOLUME/SELECT" knob to select the "SYSTEM" menu.

3. Press the "ENTER" button to enter the "SYSTEM" menu.

4. Rotate the "VOLUME/SELECT" knob to select the "BEEP" option.

5. Press the "ENTER" button to turn the beep sound "OFF".

6. Press the "FUNC" button to exit the menu.