IMMOBILIZER SYSTEM CONSTRUCTION/OPERATION [ADVANCED KEYLESS 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 engine can be started using the keys previously programmed to 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.

• The immobilizer system operates automatically when the ignition switch is turned to the LOCK or ACC position. When this occurs, the security light flashes repeatedly approx. 0.1 s every 2 s.

• Engine start is allowed in the following order.

• Additional keys can be programmed.

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

• If two keys that can start the engine are available, the Mazda Modular Diagnostic System (M-MDS) is not necessary. However, if Customer spare key programming disable is selected, the Mazda Modular Diagnostic System (M-MDS) is required.

• 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 (including key replacement)	• New steering lock unit • Programming keys (two or more)	• 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.
Simultaneous replacement of PCM and keyless control module	• New PCM • New keyless control module • 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.