2009 Toyota Tundra Owners Manual - Page 217
2009 Toyota Tundra Manual
Page 217 highlights
2 -1 . Driving proc e dure s H or n To sound the horn, press on or close to the mark. 2 When driving n After adjusting the steering wheel (manually adjustable type) Make sure that the steering wheel is securely locked. The horn may not sound if the steering wheel is not securely locked. (→P. 83) 187