2011 Toyota Tundra Regular Cab Owners Manual - Page 219
2011 Toyota Tundra Regular Cab Manual
Page 219 highlights
2-1. Driving procedures Horn 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) 191