Mazda 6 Owners Manual: Message Indicated on Display
If a message is displayed in the center display, take appropriate action (in a calm manner) according to the displayed message.
KEY Warning Light (Some models)
Take the appropriate action and verify that the warning light turns off.
...
Stop Vehicle in Safe Place Immediately
If the following messages are displayed in the center display , a vehicle system
may be malfunctioning. Stop the vehicle in a safe place and contact an Authorized
Mazda Dealer.
...
Other materials:
Mazda 6 Owners Manual: Ignition switch inspection
1. Disconnect the negative battery cable.
2. Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION)
3. Disconnect the ignition switch connectors.
4. Inspect for continuity between the ignition switch terminals using an
ohmmeter.
If not as specified, replace the ignition switch.
...
Mazda 6 Owners Manual: Immobilizer system reprogram procedure
Note
When an error occurs during the reprogram procedures, except when
the PCM is replaced, repeat the procedure from Step 1. If you still cannot
reprogram, confirm how many keys can start the engine. Then, perform the key
replacement or addition reprogram procedure according to the val ...