Take the appropriate action and verify that the warning light turns off.

Taking Action
Message Indicated on DisplayMazda 6 Owners Manual: Door Locks
WARNING
Always take all children and pets with you or leave a responsible person
with them: Leaving a child or a pet unattended in a parked vehicle is dangerous.
In hot weather, temperatures inside a vehicle can become high enough to cause brain
damage or even death.
Do not leave the key in ...
Mazda 6 Owners Manual: Sst
Some Ford SST or equivalent are used as SSTs necessary for
engine repair. Note that these SSTs are marked with Ford SST
numbers.
Note that a Ford SST number is written together with a
corresponding Mazda SST number as shown below.
Example (section ST)
Example (except section ST)
...