The High Beam Control System (HBC) operates to switch the headlights automatically between high and low beams after the ignition is switched ON and the headlight switch is in the AUTO and high beam position.
The High Beam Control System (HBC) determines that it is dark based on the brightness of the surrounding area. At the same time, the High Beam Control System (HBC) indicator light (green) in the instrument cluster illuminates.

NOTE
When the vehicle speed is less than about 20 km/h (12 mph), the High Beam Control System (HBC) switches the headlights to low beams.
High Beam Control System (HBC) (Some models)
Manual SwitchingMazda 6 Owners Manual: Selector cable adjustment
1. Remove the center console.
2. Shift the selector lever to P position.
3. Unlock the lock piece of the selector cable (selector lever side) in the
order shown in the figure.
4. Verify that the manual shaft is in P position.
5. Lock the lock piece of the selector cable (selector lever side) ...
Mazda 6 Owners Manual: Manual Shift Mode
The manual shift mode gives you the feel of driving a manual transaxle vehicle
by allowing you to operate the selector lever manually. This allows you to control
engine rpm and torque to the drive wheels much like a manual transaxle when more
control is desired.
To change to manual shift mode ...