Hello ,
It was a cable that goes to 4 fan..The 4 fan is amplased behind the left wheel , down near the floor.To see this fan an dismount , need to take away the front left wheel.Tha cable is formed by 2 wires.1 red/y that is + and another blue that is -.This wires are damaged and make short somethimes.Measured in fan connector it was low resistence.And then i take all the wires hand by hand and i find the problem.
Thank you again , and also Tr_doctor user , that have this ideea.In the future..if you have , a service manual for this model please send to me.
Regards, Gabi