Memory Seat And Mirrors - GMC 2007 Sierra 1500 Pickup Owner's Manual

To heat only the seatback, press the vertical
button with the heated seatback symbol. An
indicator light on the seatback button will come on
to designate that only the seatback is being
heated. Additional presses of the seatback button
will cycle through the heat levels for the seatback
only. Press the horizontal button again to heat
the whole seat.
The heated seats will be canceled after the
ignition is turned off. If you still want to use
the heated seat feature after you restart your
vehicle, you will need to press the heated
seat button again.
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Memory Seat and Mirrors

These buttons are used to program and recall
memory settings for the driver's seat and both the
driver's and passenger's outside mirrors. The
settings for these features can be saved for up to
two drivers.
If your vehicle has this
feature, the controls for
the memory function
are located on the
driver's door.