the problem i have shows as k bus fault on all comms.the symptoms are that on entry to the vehicle none of the systems are energised,nothing on the instrument binnicle, the sat nav monitor and the transponder coil isnt energised.fortunatly it goes into backup mode in which the car can be started on the second turn of the key after a 2.4 sec delay and everything comes back on line. at first i thought it was prob the steering colomn ecu but if that was the case surely the sat nav screen would energise as this is not on k bus? is it more likely to be the bcu as that energises the car once the doors are unlocked. any thoughts would be appriciated.