The ac compresor it dosen't start.pression is fine

It is unlikely that a fuse or relay is the culprit. It is more than likely you have a controller issue. Either the ECM for the cars computer or unless there is another controller for just the air conditioner. Not really good with newer stuff but just a thought. If your as cheap as I am you could run a test wire to the lead wire which locks the clutch for the ac compressor and starts the pump spinning to see if that keeps it on and pumps cold air for you, CAUTION improper wiring can cause more harm than good (short circuits, burnt electronics, and or fires) so be careful if you are attemting to rig this and put all the safety nets on it you can. A fuse, ignition on circuit, and plenty of double checking would be good starting points. I would not want to pay the dealer a lot of money but some times it is better than seeing your car go up in flames when you learned the lesson on how to do something correctly the hard way.

Hello. I think you mean "pressure" anyway there could be several reasons why your compressor isnt starting...
1 the relay or fuse is shot- check the fuse panel and pull the fuse with the car off and check to see if its blown. replace if it is.
2 the BCM or body control module is acting up- you are selecting a/c and it isnt telling the compressor to turn on. you could verify this by turning the a/c on and checking the voltage to the compressor with a multimeter- no voltage with a good fuse would be a good indication of this.
3 if the 1st two check out good then the problem could be with the compressor itself.
I hope that my suggestions help to point you in the right direction

that sounds like electrical problem... run tests on compressor and on ecm exit wires

Check if system is low on freon. My 325 was low this spring and the compressor was "locked out" by a low head-pressure switch. This prevents compressor damage do to lack of lubrication oil that is transported by the freon liquid.

Hope this helps, rhais.