GODIAG Test Platform For BMW CAS4 / CAS4+ Programming is a dedicated device developed for BMW locksmiths, maintenance engineers and CAS4 CAS4+ programming engineers. With this test platform, the BMW CAS4 CAS4 + key can be programmed on the workbench by OBD without opening the machine cover, thus avoiding car power loss and data loss caused by long time unlocking of the CAS4 / CAS4 + on the car.