No. 3 Replacement Procedure (Clearing Previously Registered Key ID Numbers, Key Re-Registration Conditions

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.

Customer has two or more keys for registration after clearing the key ID numbers.
Procedure

Fig 1: Identifying Registration Key
Courtesy of MAZDA MOTORS CORP.

Have two or more keys (key 1, key 2) ready for registration after the clearing the key ID numbers.
Using key 1, turn the ignition switch to the ON position.
NOTE:
- Although the security light flashes and DTC 15 is displayed, this does not indicate an improper procedure. Continue to perform the procedure as indicated.
Connect the WDS or equivalent to the DLC-2.
Select "Body/Security/PATS function" from the screen menu of the WDS or equivalent.
Perform security access as indicated on the WDS or equivalent screen. (See NO. 6 SECURITY ACCESS PROCEDURE .)
Select "Ignition key ID number Erase" from the screen menu of the WDS or equivalent and perform the tasks according to the WDS or equivalent screen.
After verifying that the PATS function menu is displayed again on the WDS or equivalent screen, select "Exit" to complete the WDS or equivalent function.
After Step 7, wait 10 s or more and turn the ignition switch to the LOCK position using key 1.
Using key 1, turn the ignition switch to the ON position.
After verifying that the security light illuminates for 3 s or more, turn the ignition switch to the LOCK position and remove key 1.
NOTE:
- Although the security light flashes and DTC 21 is displayed, this does not indicate an improper procedure. Continue to perform the procedure as indicated.
Using key 2, turn the ignition switch to the ON position.
Verify that the security light illuminates for approx. 3s and then goes out.
After verifying that the security light goes out, turn the ignition switch to the LOCK position using key 2, and then remove key 2.
If additional keys need to be registered, repeat Steps 11- 13 in the same manner as key 2. Steps 11- 13 must be performed within 1 min for each key. If the ignition switch is maintained in the ON position for 1 min or more , key registration according to Steps 11- 13 will not be possible. If this occurs, refer to "NO. 1 ADDITIONAL KEY REGISTRATION PROCEDURE (USING TWO VALID KEYS)" to register any additional keys.