Toyota PRIUS 50 2020 Series Owner's Manual page 227

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12-volt battery-saving function
In order to prevent the 12-volt battery of the vehicle from discharging, if the
headlights and/or tail lights are on when the power switch is turned off, the
12-volt battery saving function will operate and automatically turn off all the
lights after approximately 20 minutes.
When any of the following are performed, the 12-volt battery-saving function
is canceled once and then reactivated. All the lights will turn off automatically
20 minutes after the 12-volt battery-saving function has been reactivated:
When the headlight switch is operated
When a door is opened or closed
If "Headlight System Malfunction Visit Your Dealer" is displayed on the
multi-information display
The system may be malfunctioning. Have the vehicle inspected by your
Toyota dealer.
Customization
Settings (e.g. light sensor sensitivity) can be changed.
(Customizable features: P. 518)
NOTICE
To prevent 12-volt battery discharge
Do not leave the lights on longer than necessary when the hybrid system is
off.
4-3. Operating the lights and wipers
225
4

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