How to replace the pressure switch of Beiqi Shenbao X25 air conditioner?

The power supply for the pressure switch of automobile air conditioner enters the switch from pin 2 of the three-state switch through a fuse, passes through the high-voltage switch and the low-voltage switch in series, and is output to the air conditioner controller and the compressor relay from pin/kloc-0. The 4# pin of the three-state switch is grounded, and the 3# pin outputs a high-speed fan request signal to the engine computer after passing through the medium-voltage switch, that is, the condenser fan rotates at a high speed when the pressure is greater than 1.77MPa, and at a low speed when it is less than 1.37MPa.

The air conditioning pressure switch can be replaced by professional technicians in 4S shops or auto repair shops.