Pontiac 2007 G6 Owner's Manual page 186

Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog or frost from the rear window.
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REAR: Press this button to turn the rear
window defogger on or off. An indicator light
comes on to indicate that the rear window
defogger is on. Be sure to clear as much snow as
possible from the rear window.
If driving below 50 mph (80 km/h), the rear window
defogger turns off about 15 minutes after the
button is pressed. If turned on again, the defogger
only runs for about seven and one-half minutes
before turning off. The defogger can also be turned
off by pressing the button again or by turning off
the engine.
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If your vehicle's speed is maintained above
50 mph (80 km/h), the rear window defogger
remains on once the button is pressed.
If your vehicle has the remote start feature, the
rear defogger automatically turns on if it is
cold outside. When the vehicle transitions out of
the remote start mode, the rear defogger turns off.
See Remote Keyless Entry System Operation
on page 101.
Notice: Do not use anything sharp on the
inside of the rear window. If you do, you could
cut or damage the warming grid, and the
repairs would not be covered by your warranty.
Do not attach a temporary vehicle license,
tape, a decal or anything similar to the
defogger grid.