With Bluetooth System

Disconnect the negative battery cable and wait for 1 min or more.
Remove the driver-side air bag module. (See DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION .)
Disconnect the steering switch connector.
Verify the resistance between the steering switch terminals.

Fig 1: Steering Switch Circuit (With Bluetooth System)
Courtesy of MAZDA MOTORS CORP.
- If not within the specification, replace the steering switch.
Fig 2: Steering Switch Terminals Resistance Reference Chart (1 Of 2)
Courtesy of MAZDA MOTORS CORP.

Fig 3: Steering Switch Terminals Resistance Reference Chart (2 Of 2)
Courtesy of MAZDA MOTORS CORP.
Apply battery positive voltage to steering switch terminal D, and connect terminal E to ground.
Verify that the LED illuminates.

Fig 4: Steering Switch Circuit

Courtesy of MAZDA MOTORS CORP.