2006 Toyota Tundra Owners Manual - Page 260

'06 TUNDRA_U (L/O 0508) 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. Radio Cassette tape player and compact disc player 260 2006 TUNDRA from Oct. '06 Prod. (OM34458U)