The vehicle's keys have built-in transponder chips that prevent the engine from starting if a key has not been previously registered in the vehicle's on-board computer.
Never leave the keys inside the vehicle when you leave the vehicle.
This system is designed to help prevent vehicle theft but does not guarantee absolute security against all vehicle thefts.
Vehicles without a smart key system: The indicator light flashes after the key has been removed from the engine switch to indicate that the system is operating.
The indicator light stops flashing after the registered key has been inserted into the engine switch to indicate that the system has been canceled.
Vehicles with a smart key system: The indicator light flashes after the engine switch has been turned off to indicate that the system is operating.
The indicator light stops flashing after the engine switch has been turned to ACCESSORY or IGNITION ON mode to indicate that the system has been canceled.

■System maintenance The vehicle has a maintenance-free type engine immobilizer system.
■Conditions that may cause the system to malfunction
Theft prevention labelsToyota CH-R Service Manual > Occupant Classification System: System Description
SYSTEM DESCRIPTION
GENERAL
(a) The occupant detection ECU estimates the weight of an occupant based on signals
received from the 2 occupant classification sensors. The occupant detection ECU
determines whether the front passenger seat is occupied and classifies the occupant
based on the esti ...
Toyota CH-R Service Manual > Automatic Headlight Beam Level Control System: Height Control Sensor Data Out of Range When Initializing (B2452)
DESCRIPTION
The headlight ECU sub-assembly LH stores this DTC if the sensor value received
from the rear height control sensor sub-assembly LH is out of range when performing
initialization of the headlight ECU sub-assembly LH; for example, the vehicle is
not level or being jack up.
...