What must happen for WinTrac to successfully download ServiceWatch on an SR-2 unit?

For WinTrac to successfully download ServiceWatch on an SR-2 unit, it is essential that the unit must be turned on. This is because the unit needs to communicate with WinTrac and be in an operational state to facilitate the download of ServiceWatch data effectively. If the unit is turned off, it cannot establish the necessary connection, preventing any data transfer from taking place.

While having the engine running might seem beneficial for certain operations, it is not a prerequisite for the download process itself. The choice to use a specific WinTrac version does not directly impact the ability to download ServiceWatch, as compatibility is dictated by the software and device settings, not merely by the version number. Lastly, entering Pass-Through mode might be part of using WinTrac but does not address the fundamental requirement of the unit being powered on for any data to be accessible. Thus, turning on the unit is the critical first step in the process.