2954-2. Opening, closing and locking the doors 
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
4
Operation of each component
■ When “Smart Entry & Start System Malfunction See Owner’s Manual” is 
displayed on the multi-information display 
The system may be malfunctioning. Have the vehicle inspected by any autho- 
rized Toyota retailer or Toyota authorized repairer, or any reliable repairer 
immediately. 
■ Battery-saving function 
The battery-saving function will be activated in order to prevent the electronic 
key battery and the 12-volt battery from being discharged while the vehicle is
not in operation for a long time. 
● In the following situations, the smart entry & start system may take some 
time to unlock the doors. 
• The electronic key has been left in an area of approximately 2 m (6 ft.) of 
the outside of the vehicle for 10 minutes or longer. 
• The smart entry & start system has not been used for 5 days or longer. 
● If the smart entry & start system has not been used for 14 days or longer, 
the doors cannot be unlocked at any doors except the driver’s door. In this 
case, take hold of the driver’s door handle, or use the wireless remote con- 
trol or the mechanical key, to unlock the doors. 
■ Electronic Key Battery-Saving Function 
When battery-saving mode is set, battery depletion is minimized by stopping 
the electronic key from receiving radio waves. 
Press   twice while pressing and 
holding  . Confirm that the electronic 
key indicator flashes 4 times. 
While the battery-saving mode is set, the 
smart entry & start system cannot be 
used. To cancel the function, press any of
the electronic key buttons. 
         
        
        6907-3. Do-it-yourself maintenance
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
WARNING
■Battery precautions 
Observe the following precautions.  
Failure to do so may result in death or serious injury. 
● Do not swallow the battery. Doing so may cause chemical burns. 
● A coin battery or button battery is used in the electronic key. If a battery is 
swallowed, it may cause severe chemical burns in as little as 2 hours and 
may result in death or serious injury. 
● Keep away new and removed batteries from children. 
● If the cover cannot be firmly closed, stop using the electronic key and stow 
the key in the place where children cannot reach, and then contact any 
authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer as soon as possible. 
● If you accidentally swallow a battery or put a battery into a part of your 
body, get emergency medical attention immediately. 
■ To prevent battery explosion or leakage of flammable liquid or gas 
● Replace the battery with a new battery of the same type. If a wrong type of 
battery is used, it may explode. 
● Do not expose batteries to extremely low pressure due to high altitude or 
extremely high temperatures. 
● Do not burn, break or cut a battery. 
■ Certification for the smart entry & start system 
CAUTION 
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT 
TYPE. 
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS
NOTICE
■ For normal operation after replacing the battery 
Observe the following precautions to prevent accidents: 
● Always work with dry hands. 
Moisture may cause the battery to rust. 
● Do not touch or move any other component inside the remote control. 
● Do not bend either of the battery terminals.