Power Seat Adjustment; Reclining Seatbacks - GMC Sierra 2023 Manual

To adjust a manual seat:
1. Pull the handle at the front of the seat.
2. Slide the seat to the desired position and
release the handle.
3. Try to move the seat back and forth to
be sure it is locked in place.
To adjust the seatback, see Reclining
Seatbacks 0 13.
To adjust the lumbar support, if equipped,
see your owner s manual.

Power Seat Adjustment

To adjust a power seat, if equipped:
Move the seat forward or rearward by
sliding the control forward or rearward.
Raise or lower the front part of the seat
cushion by moving the front of the
control up or down.
Raise or lower the seat by moving the
rear of the control up or down.
To adjust the seatback, see Reclining
Seatbacks 0 13.
To adjust the lumbar support, see your
owner s manual.
Seats and Restraints
Some vehicles are equipped with a feature
that activates a vibrating pulse alert in the
driver seat to help the driver avoid crashes.
See Driver Assistance Systems 0 103.

Reclining Seatbacks

Warning
Sitting in a reclined position when the
vehicle is in motion can be dangerous.
Even when buckled up, the seat belts
cannot do their job.
The shoulder belt 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 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 seat belt properly.
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