1. Inspect for resistance between the front door speaker terminals using an ohmmeter.
2. To verify that the front door speaker outputs sound, apply voltage to the front door speaker and release using a 1.5-V battery.
Mazda 6 Service Manual: Service cautions
HANDLING INSUFFICIENT REFRIGERANT LEVEL
If an insufficient refrigerant level is detected at troubleshooting,
do not charge (add) the refrigerant. Because an accurate amount of
refrigerant cannot be determined from the pressure indicated on the manifold
gauge, never charge the refrigeran ...
Mazda 6 Service Manual: Audio Operation Using Voice Recognition
Voice command
When the talk button is pressed and the following command is spoken, the audio
or navigation can be operated. The commands in the () can be omitted. The specified
name and number are put into the {}.
Standard command
Communication (phone) related command
Entertainment (audi ...