IMMOBILIZER SYSTEM CONSTRUCTION/OPERATION

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• Keys contain a unique ID number that is previously programmed to the keyless control module and PCM. Due to this, if immobilizer system component parts are replaced (such as key addition/clearing or replacement of the keyless control module, instrument cluster or PCM), it is necessary to reset the system.

Key ID Number Verification Procedure

Immobilizer System Setting

• Some immobilizer system settings can be performed only using the Mazda Modular Diagnostic System (M-MDS). When using the Mazda Modular Diagnostic System (M-MDS), first, security access must be requested. Obtain security access permission according to the Mazda Modular Diagnostic System (M-MDS) screen and then perform system procedures.

Mazda Modular Diagnostic System (M-MDS) setting items

Contents

Programming an additional ignition key
Allows key ID number programming.
Ignition key ID number clearing
Clears all programmed key ID numbers and programs new key ID numbers.
Customer spare key programming enable
"Additional ignition key programming" is enabled.
Note
• This is the default setting on new vehicles.
Customer spare key programming disable
"Additional ignition key programming" is disabled.
Note
• When only the Mazda Modular Diagnostic System (M-MDS) must be used to program key ID numbers, making a forged key by using two keys that can start the engine is prevented. This function is for use by rental car agencies or other companies with vehicle fleets.

• When immobilizer system component parts (key, PCM, coil antenna, and keyless control module) are replaced, the system must be reset as described below. Refer to the Workshop Manual for the detailed setting procedure.

Component part

Setting

Key addition
Key ID number of added key must be programmed. Key ID number programming can be performed according to the following methods:
• Method for programming additional keys using two keys that can start the engine
• Method using the Mazda Modular Diagnostic System (M-MDS)
Key clearing
The programmed key ID number can only be cleared using the Mazda Modular Diagnostic System (M-MDS). When clearing key ID numbers using the Mazda Modular Diagnostic System (M-MDS), all the programmed key ID numbers are cleared.
PCM replacement
• Parameter reset must be performed.
Instrument cluster
• The key ID numbers for all keys that were being used must be programmed using the Mazda Modular Diagnostic System (M-MDS). Two or more keys must be programmed.
Keyless control module replacement
• Card key and steering lock unit must be programmed.
• The key ID numbers for all keys that were being used must be programmed using the Mazda Modular Diagnostic System (M-MDS). Two or more keys must be programmed.
Steering lock unit replacement (including key replacement)
• Steering lock unit must be programmed.
• The key ID number must be programmed using the Mazda Modular Diagnostic System (M-MDS). Two or more keys must be programmed.
Coil antenna replacement
Immobilizer system resetting is not necessary.