I'd like to start a discussion on steering angle sensor calibration/initialization for newer model Lexus vehicles. 

As far as I know, when going into hot functions for SAS calibration, then I navigate into Special Function for the initialization, it goes on to show 4 steps to follow: (all being done with the pre-requisite conditions met - flat surface - wheels straight, steering wheel straight)

1. Turn the ignition off

2. Start the vehicle

3. Drive straight at above 20km/h (12.4mph) for 5-10 seconds while avoiding micro adjustments in the steering. 

4. The vehicle will log the recorded steering angle and the initialization is complete. 

I would like to know how other shops are achieving a successful SAS calibration. I am following the steps exactly on a flat road, but I am not sure what cues to pay attention to to know if the car is making progress or whether the calibration succeeds or fails. Please, if someone can kindly share some knowledge, I would very much appreciate the help! Thank you.