GMC 2009 Sierra - Manual (Page 146)

Windshield Washer
{ CAUTION:
In freezing weather, do not use your washer
until the windshield is warmed. Otherwise the
washer fluid can form ice on the windshield,
blocking your vision.
L (Washer Fluid): Push the paddle marked with the
windshield washer symbol at the top of the multifunction
lever, to spray washer fluid on the windshield.
The wipers clear the window and then either stop or
return to the preset speed.
Heated Windshield Washer
For vehicles with the heated windshield washer fluid
system it can be used to help clear ice, snow, tree sap,
or bugs from your windshield.
The button is located in
the switchbank under the
climate controls.
Push the heated washer fluid button to activate the
heated windshield washer fluid system. The indicator
light will flash. This activation initiates four heated
wash/wipe cycles. The first heated wash/wipe cycle may
take up to 40 seconds to occur, depending on outside
temperature. After the first wash/wipe cycle, it may take
up to 20 seconds for each of the remaining cycles to
begin. Press the button again to turn off the heated
windshield washer fluid system or it will automatically
turn off after four wipe cycles have been completed.
When the heated windshield washer fluid system is
activated under certain outside temperature conditions,
steam may flow out of the washer nozzles for a short
period of time before washer fluid is sprayed. This is
a normal condition.
3-10