Strange switch!

Hi all. I have a strange switch under my dashboard, right of steering wheel. It is a moon shaped click switch with a push button green in colour that lights up. This green button has a letter “p” on it. The moon button switch has a little red light on it. Both only come on when the engine is running. Any ideas??
 
Picture & model of Z4 will help considerably pls
 
Anything happen if you operate the switch?
Will it still start and run ok if the switch is in the opposite position?
 
Dilithium Crystal Level check..only fitted to the 18i after 2015..

tisINFO says:

"Dilithium is as an extremely hard crystalline mineral that occurs naturally on some planets. It is believed that this material exists in more than three dimensions at the same time and this is somehow related to its properties. When placed in a high-frequency electromagnetic field, eddy currents are induced in its structure which keep charged particles away from the crystal lattice. This prevents it from reacting with antimatter when so energized, because the antimatter particles never actually touch it. Therefore, it is used to contain and regulate the annihilation reaction of matter and antimatter in a starship's warp core, which otherwise would explode from the uncontrolled annihilation reaction"

Furthermore "the streams of matter (deuterium gas) and antimatter (anti-deuterium) directed into crystallized dilithium are unbalanced: there is usually much more matter in the stream than antimatter. The annihilation reaction heats the excess deuterium gas, which produces plasma for the nacelle(s) and allows faster than light travel"
 
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