Without ABS
1. Remove the vehicle speedometer sensor.
2. Measure voltage (AC range) between terminals of the vehicle speedometer sensor while the gear is turning.


3. Install the vehicle speedometer sensor.
Vehicle speedometer sensor removal/installation
Manual transaxle removal/installationMazda 6 Service Manual: Locking, Unlocking the Doors
NOTE
The system may not operate if you are too close to the windows or door
handles.
If the key is left in the following areas and you leave the vehicle,
the doors may be locked depending on the radio wave conditions even if the key
is left in the vehicle.
Around the dashboard
...
Mazda 6 Service Manual: Active Driving Display (Some models)
WARNING
Always adjust the display brightness and position with the vehicle stopped:
Adjusting the display brightness and position while driving the vehicle is dangerous
as doing so could distract your attention from the road ahead and lead to an accident.
CAUTION
Do not try to adjust the ...