IMMOBILIZER SYSTEM FUNCTION

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•  The immobilizer system consists of the key (built-in transponder), coil, keyless control module, PCM, and security light (in the instrument cluster).
•  Ignition keys for use with the immobilizer system have an electronic communication device (transponder) built into the key head that retains specific electronic codes (key ID number).
•  The immobilizer system operates automatically when the ignition is switched to OFF or ACC. When this occurs, the security light flashes repeatedly approx. 0.1 s every 2 s.
•  In order to start the engine, the immobilizer system must be released using a key previously registered with the vehicle. No special operation is required to release the immobilizer system, but rather the vehicle is started similar to vehicles without the system such as when the ignition is switched from OFF or ACC to ON, or the engine is started, and the release operation begins automatically. The engine can only be started after the key, keyless control module*1, instrument cluster*2, and PCM successfully perform their parts of the verification procedure. Refer to IMMOBILIZER SYSTEM CONSTRUCTION/OPERATION for details.
•  If the immobilizer system is not released due to a malfunction or verification failure, the security light in the instrument cluster displays a DTC. At the same time, DTCs are stored respectively in the keyless control module*1, instrument cluster*2, and PCM. The stored DTCs can be verified using the Mazda modular diagnostic system (M-MDS). Repair the malfunctioning part using the verified DTCs. Refer to ON-BOARD DIAGNOSIS SYSTEM (IMMOBILIZER SYSTEM) MALFUNCTION DIAGNOSIS FUNCTION for details.
•  The immobilizer system cannot be disabled.
Caution
•  The immobilizer system must be reset using the Mazda modular diagnostic system (M-MDS) after the following replacement:
―  Vehicles with advanced keyless entry and push button start system
•  “Replacement of all the keys (steering lock replacement or similar procedure)”
•  “Keyless control module replacement”
•  “PCM replacement”
•  “Keyless control module and PCM replacement”
―  Vehicles with keyless entry system
•  “Replacement of all the keys”
•  “Instrument cluster replacement”
•  “PCM replacement”
•  “Instrument cluster and PCM replacement”
•  When performing “Replacement of all the keys” or “Keyless control module replacement”, two or more keys usable with the immobilizer system must be available.
•  Two or more key ID numbers must be registered for the engine to start. For key ID number registration, refer to the Workshop Manual, “IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [ADVANCED KEYLESS ENTRY AND push button start SYSTEM]”, “IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [KEYLESS ENTRY SYSTEM]”.
•  A maximum of eight key ID numbers can be programmed for one vehicle. The PID/data monitor function can be used to verify the number of key ID numbers programmed for a single vehicle. Refer to ON-BOARD DIAGNOSIS SYSTEM (IMMOBILIZER SYSTEM) PID/DATA MONITOR FUNCTION for details.
•  The following conditions may cause poor signal communication between the key and vehicle, resulting in the engine not starting or a key programming error. Do not perform key programming under the following conditions:
―  If any of the following items are touching or near the key head.
•  Spare keys
•  Keys for other vehicles equipped with an immobilizer system
•  Any metallic object
•  Any electronic device, or any credit card or other card with magnetic strips
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*1  :Vehicles with advanced keyless entry and start system
*2  :Vehicles with keyless entry system