The M1/M2 Buttons are located on the left hand side of the steering wheel. These buttons are meant to be used for conveniently adjusting all the settings on your vehicle. There are 5 settings that are adjustable: traction control, shift point, suspension, steering and throttle. Suspension is only adjustable if you added the adaptive M suspension. Throttle response is only adjustable on the DCT transmission.
The vehicle starts out in efficient shift point, sport suspension and sport steering. I believe the traction control will be on, but don’t quote me on that as I have not yet messed with that setting. If you have the DCT equipped, the throttle response will be in comfort. This is the default setting that BMW has programmed the car to start out with when the vehicle is turned on. These default settings are not adjustable or programmable.
The M1/M2 buttons are programmable to your liking. The following settings are listed below
The traction control can be turned fully on, partially on and completely off if you want to go sideways. The MDM is the setting where it allows the traction control to be partially on. MDM stands for M Dynamic Mode. I believe that stability control will always be on regardless of the status of the traction control settings.
The shift points for the DCT determine how long the vehicle will hold the rpms before shifting to the next gear. It is only adjustable on DCT equipped vehicles.
The suspension setting is only adjustable if equipped with the M adaptive suspension. All 2017 or newer models will have this feature as standard unless you specifically opt out of the option. The stiffness and dampening will be different depending on the mode.
The steering setting allows adjustment of the steering heaviness. In comfort, the steering wheel is light and easy to move around. In sport or sport +, the steering becomes heavier and requires more force to operate.
The throttle response determines how sensitive the throttle is to the operator’s foot on the gas pedal. There will be a delay in response from the vehicle if put into efficient mode. It also opens up the valves, giving a louder growl when accelerating or downshifting.
The M1/M2 buttons can be configured in the iDrive system under the settings. There you will be able to have the vehicle memorize your settings for each button. There are 3 modes to each button, therefore allowing you 3 to the 5th power combinations or 243 ways to customize your driving style. The HUD will also have two settings: classic and M Dynamic. Fully equipped the vehicle will give you 486 ways of adjustment to your driving.