I am not finding any listings for the ccu Central Control Unit codes. Maybe engine codes?
For bif Basic Informer: 31 no listing, 45 is voltage fault to bcu Basic Control Unit
For sfa Suspended Front Axle: 31 is fault front suspension, 45 is level 2 solenoid fault
For uic User Interface Control: 31 is fault potentiometer foot throttle, 45 is fault clutch pedal sensor(s)