2005 Lexus GX 470 Owners Manual - Page 325

AUDIO Turning the system on and off If you push "ON/SOURCE" button while receiving an emergency broadcast, a beep sounds and "INVALID" appears on the screen to indicate that no button can be operated. Push "ON/SOURCE" button to turn on the rear seat audio system. Use "ON/SOURCE" button to select an audio mode when the rear seat audio system is on. Each time you push this button, the system changes between the radio, cassette player and CD player. When you change the mode, the display indicates which mode is selected. When a cassette tape and CDs are not loaded in the front audio system, only a radio mode can be selected in the rear seat audio system. If you push "ON/SOURCE" button on rear seat audio system remote control to select the casette tape player mode or CD player mode in that case, a beep sounds from front audio system and "INVALID" flashes on the screen for 6 seconds, and then the rear audio system returns to the radio mode. 300 Push the "OFF" button to turn off the rear audio system.