Buttons on the steering wheel from the Sauber C33 Formula 1 car this season -
Yellow N button: Selects neutral from 1st or 2nd gear.
BRKBAL (brake balance) rotary switch: Adjusts the front and rear brake balance.
Black Box button: Confirms the driver’s intention to come to the pits.
Blue and orange S1/S2 buttons: These can be programmed for various funcutions.
Entry rotary switch: This allows the driver to make changes to corner entry settings of the differential.
Orange and green BRK-/BRK+ buttons: These change the brake balance between a programmed position and the current BRKBAL rotary position.
IGN (ignition) rotary switch: Controls ignition timing.
White ACK (acknowledge) button: Acknowledges changes in the system.
PREL (preload) rotary switch: Controls the preload differential offset torque.
Red Oil button: Transfers oil from the auxiliary tank to the main tank.
Black BP (bite point) button: Activates the clutch bite point finding procedure.
DRS (drag reduction system) button, upper left edge of the wheel: Activates the rear wing flap in the DRS zone.
Red PL (pit lane) button: Activates the pit lane speed limiter, limiting the car to the designated pit lane speed limit (typically 100 km/hr).
Black R button: Activates the driver radio transmission.
SOC rotary switch: Controls the state of charge of the ERS energy storage system, whether the system is generating or consuming energy.
Pedal rotary switch: Changes the pedal map dictating how the accelerator pedal responds to inputs.
Fuel rotary switch: Controls the rate of fuel consumption.
Black OT button: Activates configurable performance maps to assist the driver in overtaking or defending.
Tire rotary switch: Tells the ECU and other systems what type of tire the car is running on.
BBal-/BBal+ switches: These are used to make fine adjustments to the brake balance offset.
MFRS (multi-function rotary switch): This allows the driver and engineers to control a variety of systems that don’t require a dedicated buttons. They include engine modes (PERF), rev limiter (ENG), air-fuel ratio (MIX), turbo-compressor (TURBO), corner exit differential (VISCO), MGU-K recovery limits (BRK), MGU-K boost limits (BOOST), dashboard options (DASH), cruise control (CC, disabled for qualifying and the race), shift type (SHIFT), and the clutch bite point offset (CLU).
White -10/+1 buttons: These allow quick navigation of maps from the MFRS dial.
Unbelievably complex.