System triggering conditions
The horn sounds intermittently and the hazard warning lights flash for about 30 seconds when the system is triggered by any one of the following:
If the system is triggered again, the lights and horn will activate until the driver's door or the trunk lid is unlocked with the transmitter.
(With the advanced keyless function)
The lights and horn can also be deactivated by pressing the request switch on a door.
NOTE
If the battery goes dead while the theftdeterrent system is armed, the horn will activate and the hazard warning lights will flash when the battery is charged or replaced.
Mazda 6 Owners Manual: Close Proximity Warning
If your vehicle rapidly closes in on the vehicle ahead because the vehicle applies
the brakes suddenly while you are traveling in headway control, the warning sound
activates and the brake warning is indicated in the display. Always verify the safety
of the surrounding area and depress the bra ...
Mazda 6 Owners Manual: Engine Exhaust (Carbon monoxide)
WARNING
Do not drive your vehicle if you smell exhaust gas inside the vehicle:
Engine exhaust gas is dangerous. This gas contains carbon monoxide (CO), which is
colorless, odorless, and poisonous. When inhaled, it can cause loss of consciousness
and death. If you smell exhaust gas inside the ...