Interesting fault with Volvo 780 2007 Cummins engine

today i parked after the working 5 hours.Both the heat fans in front and sleeper was working because it is cold in Chicago.When I turned off the engine and keys out of the ignition the heat fan was still working only in the sleeper and the computer was checking the trans,differentials and trailer continiosly ,you know the "click" sound you hear when turn ignition key on before starting.May be it is a relay but don't know how to check them.Any IDEAS?I forgot ,t he abs lamp on trailer is on unless i'm moving or disconect the batteries.

 

i unplug the batteries few times for more than a day no change,and the relay dont know wich.

 

Yes,but not blowing.The problem is that mine is blowing with all the keys out.It wasn't like this few days ago.