Toyota 2012 Prius Owner's Manual page 156

Antenna location and effective range
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Antenna location
■
Effective range (areas within which the electronic key is
detected)
PRIUS PHV_OM_OM47818U_(U)
1-4. Opening, closing and locking the doors
Antennas inside cabin
When starting the hybrid system
or changing "POWER" switch
modes
The system can be operated
when the electronic key is inside
the vehicle.
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