Programming Guide for 2005 Smart Keyless Entry Remote Fob – CTS

Important Notice: The 2005 CTS does not offer onboard programming for remote key fobs. All remote fob programming must be performed using dealer-grade diagnostic tools by a trained automotive technician.

Programming Procedure:

• Step 1: Confirm that the replacement remote is compatible with the 2005 CTS and matches the specifications for the vehicle’s keyless entry system.
• Step 2: Make sure the vehicle’s battery is fully charged, as low voltage during the programming process may result in system errors or failed programming.
• Step 3: Gather all remotes you intend to use with the vehicle. Older remotes may be erased during reprogramming, so bring them all to the appointment.
• Step 4: Contact a professional technician or authorized service center that has access to the appropriate programming equipment.
• Step 5: If your vehicle is drivable, consider bringing it directly to the technician’s location to help reduce the service fee associated with mobile programming.
• Step 6: Be prepared to show documentation proving ownership of the vehicle, such as your title, registration, or a valid service record.
• Step 7: The technician will connect a diagnostic scan tool to the vehicle’s onboard system via the OBD-II port, located beneath the dashboard.
• Step 8: Through the diagnostic interface, the technician will enter programming mode to register the new key fob(s) with the vehicle’s security module.
• Step 9: Each remote is programmed one at a time. If you are adding more than one, all transmitters must be present and programmed during the same session.
• Step 10: Once the programming process is complete, the technician will test each remote to verify correct function, including locking, unlocking, and trunk operation.
• Step 11: If your key fob includes a physical key, return it to the remote after programming and store backup remotes in a secure location.