Toyota Land Cruiser Prado 2012 Manual page 153

 System maintenance
The vehicle has a maintenance-free type engine immobilizer system.
 Conditions that may cause the system to malfunction
 If 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
L/C150_OM_OM60J78E_(EE)
1-6. Theft deterrent system
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