2005 Hummer H2 Owner's Manual - Page 242

The traction off light will come on when a Traction Control System or Anti-Lock Brake System problem has been detected and the vehicle needs service. See Traction Off Light on page 3-34. When the traction off light is on, adjust your driving accordingly. The traction control system, as delivered from the factory, will automatically come on whenever you start your vehicle. Locking Rear Axle The locking rear axle can give your vehicle additional traction from the rear wheels when traveling in off-road situations such as mud, snow, sand, steep hills and uneven terrain. The button used to turn this feature on or off is located above the transfer case buttons to the right of the steering wheel. To lock the rear axle, do the following: 1. Place the transfer case in the 4LO Lock mode. This is the only mode which will allow the rear axle to lock. See All-Wheel Drive on page 2-32 for more information regarding the transfer case and 4LO Lock mode. 2. Press the button with the vehicle stopped or moving less than 2 mph (3 km/h). 4-10