On all Toyotas equiped with the "battery-saver feature" front ceiling lights when not turned on manually (means leave the front switch to the DOOR setting) will go off if front driver or passenger door is left open (did not tried with rear doors open, but it should work as well) after 20 min. (i.e. 2007 TCH) and 30 min. (i.e. 2006 Sienna). I have performed these tests couple of times on both 2006 Sienna and 2007 TCH successfully.