1. What is BIW
White plus interior and exterior of the vehicle body (including the instrument panel, the direction of the column, a seat, front and rear windshield, mirror housings, fenders, tanks, headlights , carpets, interior guard, etc.) and the doors, hood, trunk lid, and electrical and electronic systems on the formation of the body in the true sense, called trimmedbody inline, which means packed body, on this basis, plus a chassis (including the engine, gearbox, transmission, braking system, suspension system, exhaust system, etc.) on the formation of the vehicle.