When the AC light comes on there should also be a book symbol and an error code appear in the AC window. What does yours sayIJ I think that in 2001IJ model year the system was changed and unplugging the pressure switches will not allow the system to operate. If you have to bypass a pressure switch there is a problem in the system. For starters, make sure that the evaporator under the seat and the condensor are clean. Also make sure that the return air filter behind the seat is not restricted as this can also cause problems. Please post additional information about the fault code.