1. Remove the climate control unit.
2. Inspect for continuity between the fan switch terminals using an ohmmeter.


Climate control unit inspection
Defroster switch inspectionMazda 6 Service Manual: Indication on Display
The Distance Recognition Support System (DRSS) operation status is indicated
in the active driving display or multi-information display. Regarding malfunctions,
check the vehicle conditions or have it inspected by an Authorized Mazda Dealer
according to the content of the displayed message.
R ...
Mazda 6 Service Manual: Power Steering
Power steering is only operable when the engine is running. If the engine
is off or if the power steering system is inoperable, you can still steer, but
it requires more physical effort. If the steering feels stiffer than usual
during normal driving or the steering vibrates, consult an A ...