SMAX Blower Motor AUC Sensor Fault

Sounds plausible. The AUC sensor, or cabin air sensor, can cause blower issues. Have you checked the sensor's connector for corrosion or damage? Is the auto recirculation function behaving erratically?

I inspected the connector visually but didn't notice any obvious corrosion. Given the sensor's location, a more thorough examination might be warranted. How would erratic recirculation behavior manifest?

Erratic behavior would likely present as recirculation randomly cycling on and off, or failing to engage when it should, based on air quality. If you're not seeing that, and the connector looks good, a deeper dive is needed. Since you lack obvious symptoms beyond the inoperative blower, I'd advise getting it checked professionally to avoid unnecessary component swaps.

Took your advice and the problem was indeed the AUC sensor. Replaced it; cost 95€. Blower motor is now functioning correctly. Thanks again for your assistance.