Immobilizer System Component Replacement/Key Addition & Clearing: Foreword

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

When performing the following procedures, the immobilizer resetting procedure using the WDS or equivalent must also always be performed: "Keyless control module replacement", "PCM replacement", "Keyless control module and PCM joint replacement", "Key ID number clearing". The engine will not start unless all work is performed using the WDS or equivalent.
There are two methods for registering an additional key: Using the WDS or equivalent and using two keys that are able to start the engine.
When replacing any of the immobilizer system component parts, adding/erasing keys or performing other functions, refer to the following table and perform the applicable procedure (Nos. 1 to 5).

Fig 1: Immobilizer System Component Replacement/Key Addition & Clearing Reference Table (1 Of 2)
Courtesy of MAZDA MOTORS CORP.

Fig 2: Immobilizer System Component Replacement/Key Addition & Clearing Reference Table (2 Of 2)
Courtesy of MAZDA MOTORS CORP.

CAUTION:

The following conditions may cause poor signal communication between the key an vehicle, resulting in the engine not starting or a key registration error. Do not perform key registration 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 or other cards with magnetic strips

Fig 3: Displaying Warning Examples
Courtesy of MAZDA MOTORS CORP.

NOTE:

Within the following procedure, the term a "valid key" means a "key that can start the engine".
After adding/registering keys, clearing ID numbers or replacing any component part of the immobilizer unit, verify that all keys can start the engine within 5 s.
When verifying that the keys can start the engine, wait at least 5 s or more between inserting them.
If the engine cannot be started using a registered key, repeat the procedure from the beginning.
Do not start the engine until the key registration procedure for all the necessary keys is completed. If the engine is started during the registration procedure, registration is stopped at that point. Repeat the procedure starting from the beginning if the engine is started before completion.
Two or more key ID numbers must be registered for the engine to start.
A maximum of eight key ID numbers can be registered for one vehicle. The WDS or equivalent can be used to verify the number of key ID numbers registered for the signal vehicle.
Do not select screen menus of the WDS or equivalent that are not indicated within the procedures.