Programming a Spare Key

Toyota Prado 120 Series
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This guide provides instructions on programming a spare key and remote for your vehicle. It covers both immobilizer programming (making the car recognize the key for starting) and remote programming (for door lock/unlock functionality).

Problem

New owners often receive only one key with their vehicle and seek to program a spare for convenience or security. Programming may fail if the incorrect procedure is followed or an incompatible transponder is used.

Solution

  1. Purchase the Correct Key:

    • Ensure the replacement key has a transponder with a matching code to your existing key. The code is often printed on the transponder itself (e.g., 50171). Purchase from suppliers who provide this code.
    • Aftermarket keys and remotes with transponders can be used as a more cost-effective option than purchasing through dealerships.

  2. Immobilizer Programming (Key Recognition):

    • Prerequisites: You MUST have a working “master” key (a key with a remote, including copies).
    • Steps:
      1. Close the driver’s door.
      2. Wait 10 seconds. Insert a registered key into the ignition. The security indicator light should turn off.
      3. Within 3 seconds, remove and insert the registered key four times within 10 seconds.
      4. Open and close the driver’s door six times within 20 seconds.
      5. Remove the registered key.
      6. Within 10 seconds, insert the new key to be registered. The security indicator should flash. Leave the new key in the ignition for 60 seconds. The security indicator should stop flashing.
      7. The new key is now registered.

  3. Remote Programming (Door Lock/Unlock):

    • Prerequisites: Key removed from the ignition, driver’s door open.
    • Steps:
      1. Insert the key into the ignition switch, then remove it TWICE.
      2. Within 40 seconds, close and open the driver’s door TWICE.
      3. Insert the key into the ignition switch, then remove it.
      4. Within 40 seconds, close and open the driver’s door TWICE.
      5. Close the driver’s door.
      6. Insert the key into the ignition.
      7. Switch the ignition to “ON” for 2 seconds, then “OFF”.
      8. Remove the key.
      9. The vehicle should lock and unlock to indicate programming mode.
      10. Within 20 seconds: Simultaneously press and hold the lock and unlock buttons on the remote until the light on the remote flashes once.
      11. Press and hold the lock button until the light on the remote flashes twice.
      12. The system should now lock and unlock the vehicle.
      13. If the system locks and unlocks twice, programming was unsuccessful. Repeat from step 10.
      14. To exit programming mode, open the driver’s door.

Key Considerations

  • Master Key vs. Valet Key: Ensure you are using a master key for programming. A master key will make the immobilizer light on the dash go out straight away when you insert it. A valet key will make the immobilizer light stay on for a few seconds.
  • Immobilizer Memory Limit: Older vehicles might have a limit to the number of keys that can be registered in the immobilizer’s memory. If you encounter issues, consider having an auto locksmith erase the stored codes.
  • Auto Locksmiths: A mobile auto locksmith can supply, clone, and program keys, which can be a simpler option than attempting the procedure yourself, especially if you lack a working remote. They can also supply flip-out style keys.

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