GMC Acadia 2012 Owner's Manual page 59

Power Lumbar
If available, press and hold the front
or rear of control to increase or
decrease lumbar support. Release
the control when the seatback
reaches the desired level of lumbar
support.
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.
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.
Seats and Restraints
WARNING (Continued)
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.
Do not have a seatback reclined if
(Continued)
the vehicle is moving.
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