It’s easy to tell if it’s working or not just by looking at the ASS button on the console. If it’s lit up, ASS is off. If it stays lit up after the next ignition cycle, then it is remembering the last setting, so it is working in that case. If it’s not lit up after the next cycle, it isn’t remembering the setting, so it’s not working. If it’s not lit up and there are no stop/starts, then yes, the battery isn’t fully charged, or the AC or heater needs the engine running.