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 > Tire Pressure Warning System: Initialization
INITIALIZATION
NOTICE:
Initialization can be confirmed through the tire pressure warning light.
If the ignition switch off during initialization, the tire pressure
warning ECU and receiver memorizes that initialization was being performed.
Therefore, it is not necessary to p ...
Toyota CH-R Service Manual > Rear Door Lock: Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE
1. INSTALL NO. 1 REAR DOOR LOCK REMOTE CONTROL CABLE ASSEMBLY
(a) Engage the guide to install the No. 1 rear door lo ...