2008 Hummer H2 Owner's Manual - Page 274

To turn the system off, press the TCS button for five seconds. Locking Rear Axle The locking rear axle can give the 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 below the transfer case dial to the right of the steering wheel. This light will come on steady when the traction control system has been turned off. This light flashes when TCS is active. To lock the rear axle: If you press the TCS button, the traction control system will turn off and a TRACTION CONTROL OFF message will appear on the DIC. Press the TCS button again to turn the system back on. The TRACTION CONTROL 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. 1. Place the transfer case in the Four-Wheel-Low Lock mode. This is the only mode which will allow the rear axle to lock. See Full-Time Four-Wheel Drive on page 2-36 for more information regarding the transfer case and Four-Wheel-Low-Lock mode. 2. Press the button with the vehicle stopped or moving less than 2 mph (3 km/h). 4-6