Service Light ON / Air Conditioning problem

Halooo i'm so lucky because found this website.. hopefully i can settle my problem with help from members over here... thanks

i'm having a 316iA...
i bought this vehicle with the service warning lights ON and the Air conditioning with some problem... now it turn to deep trouble for me.....
at first the A/C system not cold at times while i'm driving...
And Now when i turn ON my blower, the fuse blow immediately...

i found out that the A/C recirculating button and a/c compressor switch
is lack of some wiring, what i mean is the wiring has been cutted off by the prvious owner... so i not sure whats going on...
i dare not to dismantle anything before i get the A/C wiring diagram.
Can any member over here help me by giving some ideas on what is going on to my car ? i need some solution to solve this problem...

Anyone here know how to reset the service indicator lights without using any special tools?

Your information will be much appreciated... thank you very much..