Buick 2010 Lacrosse Owner's Manual page 221

Climate Controls 7-7
Rear Window Defogger
(Rear Window Defogger):
Do not try to clear frost
Sensors
or other material from the inside
of the front windshield and rear
window with a razor blade or
anything else that is sharp. This
may damage the rear window
defogger grid and affect your
radio's ability to pick up stations
clearly. The repairs wouldn't be
covered by your warranty.
(Heated Steering Wheel):
Remote Start Climate Control
Operation: