Displays in the following cases:

Stop Vehicle in Safe Place Immediately
Message Indicated in Multi-information DisplayMazda 6 Owners Manual: Inspection of dtcs for condition detection mode
Note
The cruise set indicator light will illuminate for 3 seconds,
when condition detection mode is on.
If the RESUME/ACCEL switch on the cruise control switch is
malfunctioning, the cruise set indicator light will not give a correct
indication when you inspect the system.
1. Drive ...
Mazda 6 Owners Manual: Key reminder switch inspection
1. Disconnect the negative battery cable.
2. Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION)
3. Disconnect the key reminder switch connector.
4. Inspect for continuity between the key reminder switch terminals using an
ohmmeter.
If not as specified, replace the key reminder ...