Lexus 2004 GX470 Owner's Manual page 306

Front audio system operation
All the modes of the front audio system can be operated on the
rear seat entertainment system.
When the same mode is selected on the front and rear audio
systems simultaneously, the system can be operated on the
front audio system.
If the radio mode is selected on the front and rear audio
systems at the same time, AM and FM modes cannot be
changed on the rear seat audio system.
Selecting the mode
Use the joy stick to select the mode. Push the "ENT"
button to enter the mode.
The mode display which is selected by the joy stick is
colored blue. When the "ENT" button is pushed, the mode
display changes to green. If the mode display is gray, it
cannot be selected.
The "Speaker sound" on the mode display is selected on the
front audio system.
When you select a mode, the screen indicates which is
selected.
Finish
AUDIO
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