2004 Hummer H2 Owner's Manual - Page 299

Selectable Extended Rear Ride Height If your vehicle has this feature it comes as part of the electronically controlled air suspension system. The selectable rear ride height allows you to raise the rear of the vehicle about 2 inches (5 cm) over the normal ride height. This can be helpful when driving off-road where you may need more ground clearance to clear an obstacle. The button that controls this feature is located on the instrument panel to the right of the steering wheel. To use this feature, ensure that the following conditions are met: • The engine must be running. • All doors must be fully closed. The suspension will not raise or lower if a door is open. • The vehicle speed must be less than 40 mph (64 km/h). The system will not activate otherwise. Press the height control button to raise the rear of the vehicle. A light in the button will begin to flash as the rear of the vehicle rises. Once the extended height has been reached (this may take up to a minute), the warning light will stop flashing and will stay lit while the vehicle is at the extended height. To lower the vehicle to the normal ride height, press the button again. The light in the button will flash as the suspension lowers. When the light in the button stops flashing and goes out, the suspension has reached the normal ride height. This feature will lower the vehicle to the normal height if vehicle speed exceeds 40 mph (64 km/h). You may also want to use this feature when ascending, descending or cresting a steep hill as this can help prevent the rear bumper from dragging on the base of the hill or prevent the vehicle from grounding out (high centering) on the crest of the hill. Do not use this feature when towing a trailer. 4-73