Subaru 2004 Impreza - Manual (Page 179)

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Instruments and controls
Windshield wiper deicer (if equipped)
The windshield wiper deicer operates only when the
ignition switch is in the “ON” position.
Before turning on the windshield wiper deicer, remove
any snow from the windshield. To turn on the wind-
shield wiper deicer, push the switch. The indicator light
located on the switch lights up while the windshield
wiper deicer is operating.
The windshield wiper deicer will automatically shut off
after about 15 minutes. If the windshield wiper blades
have been deiced completely before that time, push
the switch to turn it off. It also turns off when the igni-
tion switch is turned to the “ACC” or “LOCK” position.
If deicing is not complete when you restart your vehi-
cle, you have to push the switch to turn the deicer on
again.
NOTE
If your vehicle is equipped with the outside mirror
defogger, the outside mirror defogger operates
while the rear window defogger is operating.
To prevent the battery from being discharged,
do not operate the windshield wiper deicer con-
tinuously for any longer than necessary.
UG3515BA