Toyota 2012 Highlander Owner's Manual page 192

2-3. Operating the lights and wipers
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The rear window wiper and washer can be operated when
Vehicles without smart key system
The engine switch is in
Vehicles with smart key system
The "ENGINE START STOP" switch is in IGNITION ON mode.
NOTICE
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When the rear window is dry
Do not use the wipers, as they may damage the rear window.
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the "ON" position.