Connect battery positive voltage to terminal A and ground to terminal B of the blower motor and verify its operation.

Blower motor removal/installation
Resistor removal/installationMazda 6 Service Manual: To Operate the System
The High Beam Control System (HBC) operates to switch the headlights automatically
between high and low beams after the ignition is switched ON and the headlight switch
is in the AUTO and high beam position.
The High Beam Control System (HBC) determines that it is dark based on the brightness
...
Mazda 6 Service Manual: Customer Assistance (Puerto Rico)
Your complete and permanent satisfaction is our business. That is why all Authorized
Mazda Dealers have the knowledge and the tools to keep your Mazda vehicle in top
condition. If you have any questions or recommendations for improvement regarding
the service of your Mazda vehicle or servicing ...