I hear a winding down noise when I turn the ignition off as engine shuts down.

What is your question?

When I turn off the ignition only 2015 Toyota Tacoma Pro sport, I hear a noise. Like something winding down, powering off. Possibly a small motor or electrical device. Sounds close to firewall. Any ideas

What makes this problem better or worse?

Just purchased this vehicle used.

How long has your 2015 Toyota Tacoma had this problem?

Just noticed this noise.