2018 Toyota Prius C

2018 Toyota Prius C Smart Key Programming Instructions Keyless Entry Remote Fob

Step-by-Step Process Important Notice: The 2018 Toyota Prius C is not equipped with an onboard programming feature for smart key remotes. Adding or replacing a smart key requires specialized diagnostic equipment and access to the vehicle's immobilizer system.

Programming Procedure:

  • Step 1: Ensure the vehicle is parked securely with the ignition turned OFF. Make sure all doors are closed and windows rolled up to avoid any interruptions during the procedure.
  • Step 2: Have at least one functioning smart key available, if possible. If no keys are currently programmed, the vehicle may require a security bypass process before accepting a new key.
  • Step 3: A trained technician will connect a Toyota-compatible diagnostic scan tool to the vehicle’s onboard diagnostic (OBD-II) port, located under the driver's side dashboard.
  • Step 4: Once connected, the system software will initiate communication with the vehicle’s electronic control modules, including the Body ECU and Smart Key ECU.
  • Step 5: The technician will follow the guided steps provided by the diagnostic system to register the new smart key. If applicable, they will also confirm any previous keys that need to be retained or erased from the system.
  • Step 6: After programming, the system will display confirmation that the new remote has been accepted. At this point, the technician will verify full functionality of all remotes—including smart entry, remote lock/unlock, and push-button start.
  • Step 7: Power down the diagnostic tool and disconnect it from the vehicle. Wait at least 30 seconds, then test the smart key's proximity detection, door locking functions, and engine start.

Additional Information:

  • The 2018 Prius C uses Smart Key System with Push Button Start on select trims. Confirm your model's configuration before beginning. If no keys are available, a ""Smart ECU reset"" may be required, which involves additional time and security authentication. It is recommended to always keep a backup key in a secure place to avoid full key loss. Avoid strong radio interference or low battery voltage during the programming process, as this may disrupt communication.