Component Placement Volvo Bus Corporation Electrical distribut.unit, chassis Note: The table includes components that the vehicle is not equipped with. See also, 300, Component placement, Description, Design and function The reader is advised that printed copies are uncontrolled. 32 Placement Components named according to wiring diagram 1 ARTIC, BB1, BS1, ENG1, IB10 BB2, BOGIE, BS2, IB9, EMS BB3, ECS1, IB8, RA1