See also:

DISC Button
Pressing the DISC button will allow you to switch from AM/FM modes to Disc modes. ...

Overdrive Operation
The automatic transmission includes an electronically controlled Overdrive (fifth gear). The transmission will automatically shift into the Overdrive gear if the following conditions are present: ...

Power Switch/Volume Control (Rotary)
Push the ON/VOLUME control knob to turn on the radio. Push the ON/VOLUME control knob a second time to turn off the radio. ...