Lotus F1 Steering Wheel Controls In Detail    

4 Top Left -Downshift
14 Top Right - Upshift
7 Bottom Left - Clutch
17 - Bottom Right - Clutch

MISC Toggles

9 - Launch automatically selects start settings

Left Buttons, top to bottom

1 - N
The neutral button. Used to select neutral gear and reverse.
2 - PC This is a confirm button to let the engineers know that the driver has heard a request (mainly used for pit confirming).
3 - Talk This latches the radio on for 30 seconds or alternatively the driver can press it again to turn the radio off. A red LED light illuminates while the radio is latched on.
5 - 10 This button has two functionalities. Firstly I need to explain the functionality of the driver defaults. The driver can select a "driver default" from 1 to 77. These defaults are used to enable/disable sensors/functions which are in error or need to be modified (for instance activating a fuel pump). When the MFS rotary is in the DEF position the "10" and "1" buttons allow the driver to scroll through driver default numbers. When the MFS is in any position other than the DEF position the "+" and "-" button allows the driver to scroll up/down the map number assigned to that MFS position.
6 - SC When the safety car is deployed a reference lap time (supplied by the FIA) is displayed on the dash. The driver must remain above this lap time to ensure he is not deemed to be driving too fast under the safety car. The SC button allows the driver to turn off this reference lap time once he has joined the train behind the safety car.
8 - Drink Simply gives the driver a drink.

Right buttons, top to bottom

11 - Pit The driver presses this coming up to the pit limiter line. The driver keeps the throttle pedal pressed and the SECU controls the engine to keep the car speed at the pit limit target (100km/h for races). To slow down below the pit limit speed the driver simply lifts off the throttle pedal
12 - Wing When pressed the rear wing flap position is adjusted to the angle corresponding to the lowest drag.
13 - ACK This confirms any driver default change.
15 - 1+ The "1" button changes the index numbers of the driver defaults. The "+" button scrolls up the maps selected by the MFS rotary.
16 - Oil Activates transfer of oil from the auxiliary tank to the main engine oil system
18 - BPF This enable the Bite-Point-Finder(BPF). The BPF engages the clutch three times until the engine speed drops allowing the bite point to be measured automatically.
20 - RED Button Spare button.
Rotaries (from top left, counter clockwise)

21 - MID This modifies the differential torque demand as the driver comes off the brakes and into the corner apex (MIDdle of the corner).
22 - EXIT This modifies the differential torque demand as the driver goes on the throttle pedal exiting the corner (corner EXIT).
23 - ENTRY This modifies the differential torque demand under braking (corner ENTRY).
24 - MIX modifies the fuel/air ratio (MIXTURE). Basically selects lean or rich maps
25 - EB modifies the engine torque demand when braking (engine speed dependant)
26 - MFS multifunction switch as per last year (any function can be allocated to this rotary)
27 - RPM The driver selects different engine mapping from this rotary. Maps vary from maximum performance, as used in qualifying, to maps used when driver is behind a safety car.

Outer Rotaries

9 - Clutch This modifies the clutch bite point.
18 - Tyres The driver must rotate this to match the tyre fitted. When an intermediate or wet tyre is selected the rain light is turned on. The tyre circumference is also changed in the SECU to ensure the measured speed is accurate. Changing tyre type can also modify the many control strategies such as the speed of a gear shift and the torque map.