electrical problems

hi all, i have a 99 toyota hiace bus and my issue is that whenever i press the brake pedal the little green light in the AC button comes on.. i tore down the dash and cant find any problems with the wires. i found a few loose ground connections and repair those but i am still having the problem. can anyone hep plz.. dont know what else to do.

looks like the brake light bulb which you use is fake , try to change another brand of bulb.it will end .