GMC 2000 Yukon XL Owner's Manual page 19

Heated Front Seats (If Equipped)
The control for the driver's side heated seat is located
on the driver's side door panel. The control for the
passenger's side heated seat is located on the passenger's
side door panel.
To activate the heated seats, press the button once for
the HI heat setting. Press the button again for the LO
heat setting. To turn off the heated seats, press the
button a third time. An indicator light on the button will
illuminate for each heat setting anytime the heated seats
are operating.
The heated front seats will be canceled after the ignition
is turned to OFF. If you still want to use the heated front
seat feature after you restart your vehicle, you will need
to press the heated seat button again.
1-6
If your vehicle has heated
front seats, the ignition
must be in RUN for them
to operate.
Reclining Seatbacks
To adjust the front seatback, lift the lever upward.
Release the lever to lock the seatback where you want it.
Lift the lever again upward and the seatback will go to
an upright position.
If your vehicle has power seats with a power recliner,
see "Power Seats" in the Index for further information
on how to operate the reclining seatback feature.