This feature prevents all power windows from operating, except the driver's power window. Keep this switch in the locked position while children are in the vehicle.
Locked position (button depressed):
Only the driver's power window can be operated.
Unlocked position (button not depressed):
All power windows on each door can be operated.

NOTE
When the power window lock switch is in the locked position, the light on each power window switch, except for the driver's power window switch, turns off. The light may be difficult to see depending on the surrounding brightness.
Operating the Power Windows
Moonroof (Some models)Mazda 6 Owners Manual: Illuminated Entry System
When the illuminated entry system operates, the overhead lights, the courtesy
lights, and an ambient light* turn on in the following conditions:
The driver's door is unlocked after the ignition is switched OFF.
The ignition is switched OFF with all doors closed.
NOTE
(Overhead lights) ...
Mazda 6 Owners Manual: Actuator cable removal
1. Remove the plug hole plate.
2. Remove the cover from the cruise actuator. (See CRUISE ACTUATOR
REMOVAL/INSTALLATION.)
3. Remove the installation nut and pull the cruise actuator toward you.
4. Move the throttle, and remove the end fitting of the actuator cable from
the throttle.
5. Sque ...