2006 Hummer H3 Owner's Manual - Page 206

If you press the TC button once, the traction control system will turn off and a TRAC OFF message will appear on the DIC. Press the TC button again to turn the system back on. The TRAC OFF message will then go off. The traction control system will reset itself at each ignition cycle. If your vehicle also has StabiliTrak®, see StabiliTrak® System (Automatic Transmission) on page 4-11 for more information. Adding non-GM accessories can affect your vehicle's performance. See Accessories and Modifications on page 5-3 for more information. 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 2-22 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). You must wait for the light in the button to stop flashing and remain illuminated before the rear axle is locked. Notice: If you try to lock the rear axle while your vehicle is stuck and the tires are spinning, you could damage your vehicle's drivetrain. The repairs would not be covered by your warranty. Always lock the rear axle before attempting situations and/or navigating terrain which could possibly cause the vehicle to become stuck. The locking rear axle will be disengaged when the wheel speed is greater than 20 mph (32 km/h), if the vehicle's battery is low and/or the transfer case is shifted out of 4LO Lock mode. Notice: If you lock the rear axle while driving on pavement, you could damage your vehicle's drivetrain. The repairs would not be covered by your warranty. Do not use the locking rear axle on pavement. If you need four-wheel drive when traveling on pavement, use only 4HI. Locking Rear Axle Your vehicle may have this feature. 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 to the right of the transfer case buttons on the center of the instrument panel. 4-10