Immobilizer System Component Replacement/Key Addition And Clearing[With Keyless Entry System]: Foreword

When performing the following procedures, the immobilizer resetting procedure using the M-MDS 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 M-MDS.
There are two methods for registering an additional key: Using the M-MDS 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).

IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING PROCEDURE [WITH KEYLESS ENTRY SYSTEM]

Situation	Items neccesary to perform procedure (always have these ready before beginning the procedure)	Cautionary notes	No.
Making a spare key when the customer has two or more keys that can start the engine. Or registering an additional key.	Keys for registration	If "Customer Spare Key Programming Disable" has previously been performed using the M-MDS, the M-MDS must be used to register an additional key. In that case, perform procedure No.2.	1
Making a spare key when the customer has one key that can start the engine or no keys. Or registering an additional key.	Keys for registration M-MDS	-	2
Clearing previously registered key ID numbers.	Keys for registration (two or more keys) M-MDS	All key ID numbers registered in the vehicle are cleared. Unless keys are re-registered after clearing the "key ID numbers", the engine cannot be started. Before beginning the procedure, verify that the customer has turned in all of the keys for the vehicle. Unless two or more keys are registered after clearing the key ID numbers, the engine cannot be started. The keys (two or more keys) readied before beginning the procedure do not have to be new keys. Any key that is capable of starting the engine before beginning the procedure can be used.	3
Replacing all keys. (When replacing the steering lock or similar procedure)	New keys (two or more keys) M-MDS	Since the steering lock is replaced, keys used before replacement become unusable. Have two new keys or more ready before beginning the procedure. Unless keys are registered after replacing the steering lock, the engine cannot be started.	3
Changing the method for registering additional keys. (Method for registering other keys using two keys that can start the engine is disabled.)	M-MDS	After performing this procedure it is not possible to register additional keys according to procedure No.1 .The system can be returned to the original setting. The M-MDS must always be used to change the system setting.	4
Changing the method for registering additional keys. (Method for registering other keys using two keys that can start the engine is enabled.)	M-MDS	This is the default setting on new vehicles.	4
Replacing the keyless control module.	New keyless control module Keys for registration (two or more keys) M-MDS	Unless keys are re-registered after replacement, the engine cannot be started. Before beginning the procedure, verify that the customer has turned in all of the keys for the vehicle. Unless two or more keys are registered after replacement, the engine cannot be started. The keys (two or more keys) readied before beginning the procedure do not have to be new keys. Any key that is capable of starting the engine before beginning the procedure can be used.	5
Replacing the PCM.	New PCM M-MDS	-	5
Replacing the PCM and keyless control module.	New PCM New keyless control module Keys for registration (two or more keys) M-MDS	Unless keys are re-registered after replacement, the engine cannot be started. Before beginning the procedure, verify that the customer has turned in all of the keys for the vehicle. Unless two or more keys are registered after replacement, the engine cannot be started. he keys (two or more keys) readied before beginning the procedure do not have to be new keys. Any key that is capable of starting the engine before beginning the procedure can be used.	5
Replacing the coil.	New coil	It is not neccessary to reset the immobilizer system.	-
Replacing the instrument cluster.	New instrument cluster	It is not neccessary to reset the immobilizer system.	-

CAUTION:

The following conditions may cause poor signal communication between the key and 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 1: Conditions That May Cause Poor Signal Communication Between Key & Vehicle

Courtesy of MAZDA MOTORS CORP.

NOTE:

Within the following procedures, 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 M-MDS can be used to verify the number of key ID numbers registered to a single vehicle.
Do not select screen menus of the M-MDS that are not indicated within the procedures.