Blower Fan Controller Inspection: Notes

WARNING: This page is about a different car, the 2018 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the following parts:
1. Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .)
2. Dashboard under cover (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION .)
3. Passenger-side front heat duct (See FRONT HEAT DUCT REMOVAL/INSTALLATION .)
Remove the blower fan controller. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION .)
Connect the blower fan controller connector.
Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Switch the ignition ON (engine off or on).
Connect the negative (-) lead of the tester to body ground.
Insert the positive (+) lead of the tester into each blower fan controller terminal.
Measure the voltage according to the terminal voltage table.
- If there is any malfunction, inspect the parts under "Inspection item (s)".
  - If the parts under "Inspection item (s)" are found to be normal, replace the blower fan controller. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION .)
Fig 1: Inspecting Blower Fan Controller (Manual Air Conditioner)
Courtesy of MAZDA MOTORS CORP.