Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 242 (SECURITY SYSTEM AND LOCKS SYSTEM)IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION & CLEARINGNO. 3 REPLACEMENT PROCEDURE (CLEARING PREVIOUSLY REGISTERED KEY ID NUMBERS, KEY RE-REGISTRATION CONDITIONS
2010 Mazda 5 Sport, 2.3 L, Standard
No. 3 Replacement Procedure (Clearing Previously Registered Key ID Numbers, Key Re-Registration Conditions
2010 Mazda 5 Sport, 2.3 L, StandardSECTION 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
- 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.