GMC 2006 Sierra - Manual (Page 323)

It is recommended to use this system as follows:
• For optimum ride comfort in an unloaded vehicle
the button should be out. The indicator light will
not be lit. This button position indicates NORMAL
levels of ride control or damping.
• For optimum ride comfort when trailering, fully
loaded, driving off-road, or when personal
preferences demand more control, the button should
be pressed in with the indicator light lit. This switch
position indicates FIRM levels of ride control or
damping.
The following guide can also be used to help determine
the best setting.
NORMAL: The indicator light will not be lit when the
system is in this setting. Use for normal city and highway
driving. This setting provides a smooth, soft ride when
the vehicle is unloaded.
FIRM (Unloaded): Press the button to activate this
setting, the indicator light will be lit. Use this setting
when road conditions or personal preference demand
more control. This setting provides more “feel” or
response to the road conditions.
FIRM (Loaded): Press the button to activate this setting,
the indicator light will be lit. Use this setting to minimize
trailer inputs to the vehicle or when the vehicle is fully
loaded. This setting is also appropriate for off-road
driving.
You can select a setting at any time based on road
and trailering conditions to provide the best ride and
handling. Select a new setting whenever driving
conditions change.
Locking Rear Axle
If your vehicle has this feature, your locking rear axle can
give you additional traction on snow, mud, ice, sand or
gravel. It works like a standard axle most of the time, but
when one of the rear wheels has no traction and the other
does, this feature will allow the wheel with traction to
move the vehicle.
Steering
Power Steering
If you lose power steering assist because the engine
stops or the system is not functioning, you can steer
but it will take much more effort.
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