2005 GMC Canyon Owner's Manual - Page 347

{CAUTION: Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack. {CAUTION: 2. Use the wheel wrench to loosen all the wheel nuts by turning it counterclockwise. Do not remove the wheel nuts yet. Raising your vehicle with the jack improperly positioned can damage the vehicle and even make the vehicle fall. To help avoid personal injury and vehicle damage, be sure to fit the jack lift head into the proper location before raising the vehicle. 5-75