Hummer 2004 H2 - 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.
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