How do you replace the ECM on 2005 Toyota matrix?

To replace the ECM (Engine Control Module) on a 2005 Toyota Matrix, first disconnect the negative battery terminal to ensure safety. Remove any necessary panels to access the ECM, which is typically located under the dashboard or near the engine bay. Disconnect the wiring harness and any mounting bolts securing the ECM, then replace it with the new unit. Reconnect the wiring, secure everything in place, and reconnect the battery before starting the vehicle to ensure the new ECM is functioning properly.