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 > Solar Sensor: Inspection
INSPECTION
PROCEDURE
1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR
(a) Check the wire harness.
(1) Disconnect the automatic light control sensor (G1).
(2) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Toyota CH-R Service Manual > Airbag System: Side Airbag Sensor Assembly No.2 Lost Communication (RH) (B162B/85,B162C/85)
DESCRIPTION
The side collision sensor RH circuit (bus 2) consists of the airbag sensor assembly
and floor side airbag sensor RH.
The floor side airbag sensor RH detects impacts to the vehicle and sends signals
to the airbag sensor assembly to determine if the airbags and pretensioners should
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