Toyota Corolla (E210) 2019-2025 Owners Manual / For safety and security / Theft deterrent system / Engine immobilizer system
Toyota Corolla (E210): Engine immobilizer system
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.
Operating the system

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 ACC or ON 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
- If the grip portion of the key is in contact with a metallic object
- If the key is in close proximity to or touching a key to the security system (key with a built-in transponder chip) of another vehicle
NOTICE
■To ensure the system operates correctly
Do not modify or remove the system.
If modified or removed, the proper operation of the system cannot be guaranteed.
Other materials:
Precaution
1. Work precautions
(A) vehicle protection
(1) when welding, cover glass, seats, carpets, etc. With
heat resistant fireploof covers to protect them.
(B) safety
(1) never stand in the path of the chain when using a puller
on the body or frame, and be sure to attach a safety
cable.
...
Inspection procedure
Hint:
hand–held tester only:
narrowing down the trouble area is possible by performing ”a/f control” active
test (heated oxygen
sensor or other trouble areas can be distinguished).
Perform active test using hand–held tester (a/f control).
Hint:
”a/f control” is the active te ...
Inspection procedure
1 Check d squib circuit(airbag sensor assy center – horn button
assy)
Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
disconnect the connectors between the airbag sensor
assy center and the horn button assy.
release the airbag ...


