GMC Chevrolet Tahoe 2011 Owner's Manual page 69

On vehicles with four-way
lumbar, press and hold the front
or rear of the control to increase
or decrease lumbar support. To
raise or lower the height of the
support, press and hold the top
or bottom of the control.
Reclining Seatbacks
WARNING
Sitting in a reclined position when
the vehicle is in motion can be
dangerous. Even when buckled
up, the safety belts cannot do
their job when reclined like this.
The shoulder belt cannot do its
job because it will not be against
your body. Instead, it will be in
front of you. In a crash, you could
go into it, receiving neck or other
injuries.
WARNING (Continued)
The lap belt cannot do its job
either. In a crash, the belt could
go up over your abdomen. The
belt forces would be there, not at
your pelvic bones. This could
cause serious internal injuries.
For proper protection when the
vehicle is in motion, have the
seatback upright. Then sit well
back in the seat and wear the
safety belt properly.
(Continued)
Seats and Restraints
Do not have a seatback reclined if
the vehicle is moving.
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