1. Switch the ignition to off.
2. Disconnect the negative battery cable and wait for 1 min or more
..
3. Remove the inner garnish..
4. Remove the front door trim..
5. Remove the bolts.

6. Remove the pressure sensor.
7. Disconnect the connector from the pressure sensor by pressing the connector tab and pulling out the lock lever in the direction of the arrow.

When connecting the pressure sensor connector, insert the lock lever (connector disconnection prevention lever) completely.
8. Install in the reverse order of removal.
9. Switch the ignition to ON.
10. Verify that the air bag system warning light illuminates for approx. 6 s
and goes out.
If the air bag system warning light does not operate normally, refer to the on-board diagnostic system (air bag system) and perform inspection of the system..
Brake Fluid Pressure Sensor Inspection
Refrigerant Pressure Sensor Inspection [Full Auto Air Conditioner]Stop Vehicle in Safe Place Immediately
If any of the following warning lights turns on, the system may have a
malfunction. Stop the
vehicle in a safe place immediately and contact an Authorized Mazda Dealer.
...
Air Intake Actuator Inspection [Manual Air Conditioner]
1. Connect battery positive voltage to air intake actuator terminal B (or C),
connect terminal C (or B) to ground, and then verify that the air intake actuator
operates as shown in the table.
If the operation condition is not normal, replace the air intake actuator.
...
Taking Action
Take the appropriate action and verify that the warning light turns off.
KEY Warning Light
Take the appropriate action and verify that the warning light turns off.
...