Toyota Vitz Manual page 208

3‑1. How to use the air conditioner defogger
knowledge
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Operating conditions
Vehicles without smart entry & start system
When the engine switch is "ON"
Vehicles equipped with smart entry & start system
When the "engine start / stop" switch is in ignition ON mode
caution
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To prevent the battery from running out
If you use it continuously for a long time, it may cause the battery to run down.
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