Mazda RX-8 Manual page 2060

NOTE:
Within the following procedures, the term a "valid key" means a "key that can start the engine".
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After adding/registering keys, clearing ID numbers or replacing any component part of the immobilizer
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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.
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If the engine cannot be started using a registered key, repeat the procedure from the beginning.
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Do not start the engine until the key registration procedure for all the necessary keys is completed. If the
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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.
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A maximum of eight key ID numbers can be registered for one vehicle. The WDS or equivalent can be
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used to verify the number of key ID numbers registered to a single vehicle.
Do not select WDS or equivalent that are not indicated within the procedures.
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No.1 Additional Key Registration Procedure (Using Two Valid Keys)
Conditions
Customer has two or more valid keys.
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NOTE:
A maximum of eight keys can be registered for any one vehicle. If key registration is not successful and
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DTC 15 appears even though the procedure was performed properly, use the WDS or equivalent and
verify the number of keys that have been registered.
If eight keys have already been registered, and it is necessary to register other keys, the previously
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registered key ID numbers must first be cleared. Perform key ID number clearing according to " No.3
Key Replacement Procedure (Clearing Previously Registered Key ID Numbers, Key Re-registration) ".
Procedure
1. Have an additional key (key 3) ready for registration.
2. Using key 1, turn the ignition switch to the ON position.
(w) RX-8 Body
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