The best thing to do is to go here and get the proper documentation. Any time your are near the steering wheel, disconnect the battery so you won't set off the AIR BAG!
http://bit.ly/alldata_repair_manuals
RepairPal Certified shops can diagnose and repair your 2009 Toyota Tundra. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.