Rear defrost switch flashing light?

[Cliff p]

I noticed yesterday when I started my truck that the rear defrost switch's amber light was flashing every second, and it lasted around 30 seconds to a minute.

I haven't found anything online that says why it would flash? Any ideas?

Typed on a small screeny thingy.

 

[Cliff p]

Update:

Apparently, I needed to search "blinking" and not "flashing".

It has to do with the HVAC damper control calibration. It's only done it once, and nothing was affected. Guessing it was just recalibrating the door.