[Baffler]

Is that the motor and arm for the cabin air re-circulation flap? If so it's manually activated/deactivated via its own switch on the climate control panel.

If it not functioning you'll first need to check for any obstruction of the actual flap. Lift the plastic scuttle panel and the flap is just located below the cabin filter. It could be stuck open due to lack of use or build up of detritus.

It might be wise to disconnect the arm again to check the flap is traveling fully in both directions. With the arm disconnected you can check the motor is functioning via the switch.