2009 Toyota Tundra Owners Manual - Page 425

3-5. Using the interior lights Personal/interior lights and cargo lamp main switch Rear (type D) On/off Cargo lamp main switch ON The cargo lamp can not be individually turned off. 3 Interior and exterior features Door position The cargo lamp comes on when a door is opened. They turn off when the doors are closed. OFF The cargo lamp can be individually turned on or off. 397