2008 Hummer H3 Alpha Owner's Manual - Page 202

When this message is on, the system will not limit wheel spin. Adjust your driving accordingly. The traction control system automatically comes on whenever you start your vehicle. To limit wheel spin, especially in slippery road conditions, you should always leave the system on. But you can turn the traction control system off if you ever need to. To turn the system off, press and hold the TCS button for five seconds. If you press and hold the TC button for five seconds, 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. Adding non-dealer/non-retailer accessories can affect your vehicle's performance. See Accessories and Modifications on page 5-3 for more information. 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. This light will come on steady when the traction control system has been turned off. This light flashes when TCS is active. 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. 4-6