Replace and Program ECU or Reprogram ECU

WARNING: This page is about a different car, the 2021 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

To program a replacement or an existing ECU, perform the following procedure:

Install EL-49642 SPS programming support tool.
Access the Service Programming System (SPS) and follow the on-screen instructions.
On the SPS Supported Controllers screen, select K84 Keyless Entry Control Module - Programming and follow the on-screen instructions.
At the end of programming, choose the "Clear All DTCs" function on the SPS screen.