IMMOBILIZER SYSTEM CONSTRUCTION/OPERATION

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Advanced Keyless Entry And Start System

• The immobilizer system consists of the key (built-in transponder), coil, keyless control module, PCM, and security light (in the instrument cluster).
• 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 cannot be disabled.
• The ignition cannot switch to ACC or the engine cannot be started unless a programmed key is in the vehicle.

  Caution
  • If any metallic or magnetic object is near the key, communication between the key and the vehicle may be obstructed, resulting in a failure to start the engine.

• The engine may not start due to malfunctions in other systems (engine, starter relay) even if the immobilizer system is normal. If the immobilizer system has a malfunction, the security light indicates a DTC. The indicated DTC is stored in the keyless control module and PCM.

Engine Start Operation

  • The immobilizer system activates automatically when the push button start is pressed. During this time, the security light repeatedly flashes for 0.1 s every 2 s.
  • Operates in ACC or ON in the following order:

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Additional key programming

  • Additional keys can be programmed.

  Note
  • At least two key ID numbers must be programmed to start the engine, and a maximum of eight key ID numbers can be programmed to one vehicle. Number of the programmed key ID numbers can be verified by the Mazda Modular Diagnostic System (M-MDS).

  • The Mazda Modular Diagnostic System (M-MDS) is necessary when there is one key that can start the engine or an advanced key.

Related parts programming

  • If any of the following services is performed, reprogramming of the immobilizer system using the Mazda Modular Diagnostic System (M-MDS) is necessary for proper immobilizer operation.
    Caution
    • The engine cannot be started unless reprogramming is performed using the Mazda Modular Diagnostic System (M-MDS).

Service | Items necessary for procedure (prepare before starting procedure) | Cautionary notes
--- | --- | ---
PCM replacement | • New PCM • Prepare one key that can start the engine or an advanced key. | • PCM configuration must be performed.
Steering lock unit replacement | • New steering lock unit | • Steering lock unit must be programmed.
Keyless control module replacement | • New keyless control module • Programming keys (two or more) | • Before beginning the procedure, verify that the customer has turned in all of the keys for the vehicle. • Unless key ID numbers are reprogrammed after the procedure, the engine cannot be started. • The keys (two or more) prepared before the procedure do not have to be new ones, and there is no problem with using the keys that were used to start the engine before the procedure.
Key replacement/addition | • Programming keys (two or more) | • Unless keys are reprogrammed after the procedure, the engine cannot be started. Before beginning the procedure, verify that the customer has turned in all of the keys for the vehicle. • The keys (two or more) prepared before the procedure do not have to be new ones, and there is no problem with using the keys that were used to start the engine before the procedure.

Keyless Entry System

• The immobilizer system consists of the key (built-in transponder), coil antenna, instrument cluster, PCM, and the security light (in instrument cluster).
• 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 cannot be disabled.
• The engine cannot be started without a previously programmed key.

  Caution
  • If a metallic or magnetic object is near the key, communication between the key and the vehicle may be obstructed resulting in the inability to start the engine.

• It is also possible that due to other malfunction causes in other systems (such as engine, starter relay) the engine may not start even though the immobilizer system is operating normally. If the immobilizer system is malfunctioning, the security light displays the DTC. The displayed DTC is recorded in the instrument cluster and the PCM.

Engine Starting Enabled Operation

  • The immobilizer system operates automatically when the ignition switch is turned to the OFF or ACC position. When this occurs, the security light flashes repeatedly approx. 0.1 s every 2 s.
  • The order of operation for enabling engine starting is as follows:

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Additional Key Programming

  • Additional keys can be programmed for starting the vehicle engine.

  Note
  • Two or more programmed key ID numbers are necessary for starting the engine, and a total of 8 key ID numbers can be programmed per vehicle. The number of programmed key ID numbers can be verified using the Mazda Modular Diagnostic System (M-MDS).

  • When there is one key which can start the engine or an advanced key, the Mazda Modular Diagnostic System (M-MDS) is necessary.

  • When there are two keys which can start the engine, the Mazda Modular Diagnostic System (M-MDS) is not necessary. However, if the customer spare key programming is disabled, the Mazda Modular Diagnostic System (M-MDS) becomes necessary.

Programming of Related Parts

  • When performing the following servicing, it is necessary to reprogram the immobilizer system. Always use the Mazda Modular Diagnostic System (M-MDS) so that the immobilizer system operates normally.
    Caution
    • If reprogramming is not done using the Mazda Modular Diagnostic System (M-MDS), the engine cannot be started.

Service | Items necessary for procedure (prepare before starting procedure) | Cautionary notes
--- | --- | ---
PCM replacement | • New PCM • Have a key on hand which can start the engine, or an advanced key. | • PCM configuration is necessary.
Instrument cluster replacement | • New instrument cluster • Keys for programming (2 or more) | • Before beginning the procedure, verify that the customer has turned in all of the keys for the vehicle. • Unless the key ID numbers are reprogrammed after the replacement, the engine cannot be started. • The keys (2 or more) prepared before beginning the programming can be new keys or keys which were able to start the engine.
PCM and instrument cluster replaced simultaneously | • New PCM • New instrument cluster • Keys for programming (2 or more) | • Unless keys are reprogrammed after the procedure, the engine cannot be started. Before beginning the procedure, verify that the customer has turned in all of the keys for the vehicle. • The keys (2 or more) prepared before beginning the programming can be new keys or keys which were able to start the engine.