Toyota Hilux Owner's Manual page 74

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1-3. Theft deterrent system
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System maintenance
The vehicle has a maintenance-free type engine immobilizer system.
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Conditions that may cause the system to malfunction
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If the grip portion of the key is in contact with a metallic object
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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
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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.