Re-circulation switch

Dear, 

My switch for re-circulation is not working, nothing happens when pushed, even LEDs don't light. 
I open the switch according following instructions:  sternzeit-107.de/de/slpedia/werkstatt-gr...uftschalterreparatur
and clean the contact, but without success. 
Would you give me info how to check functionality of the switch ? 
There are 3 pins on the switch  15, 31, 58 . 
Maybe I can connect 12 V and ground to those pins ?
Any other idea for checking function of the switch ?

Best Regards
Stan  
 

15=switched 12v
31= ground from Battery
58 = lights

Thanks Andreas,

I checked the switch according your connection plan and it's working
Maybe the problem is with the power coming from the car ?
Any suggestion what have to check ?

BR
Stan

Hello Stan,

the recirculation is only working when the blower runs. The 12V (yellow-black cable) comes from the blower-ecu: Pin 8
It´s also possible, that the recirculation has some delay after starting the engine, max. one minute (the higher fan steps are blocked after starting to prevent cold air at start driving).