Problem:
I purchased GODIAG For BMW BDC2/BDC3 Programming Test Platform and GODIAG For BMW BDC3/BCP Programming Test Platform, applying power only illuminated the green LED and the cable appeared nonfunctional.
Technician clarified that this behavior occurs when the GODIAG BMW BDC2/BCP Programming and GODIAG BMW BDC3/BCP Programming Test Platform is powered without being connected to the required vehicle modules. Simply supplying power to the interface is insufficient; the platform must be correctly wired to the BDC3 control unit, the instrument cluster (dashboard), and the remote-control receiver module as shown in the official connection diagram. Once these components are connected, communication initializes, and the interface becomes responsive for diagnostics, programming, or key-related operations.
Solution:
First, connect the test platform to BDC3 module, then link dashboard and remote receiver, ensuring stable power and ground. The image provided illustrates the complete harness layout, highlighting that the DB25 interface and auxiliary leads must be seated firmly. The customer acknowledged the instruction. In summary, the green light alone indicates power but not active communication; full functionality requires the complete module chain connected according to the diagram. Following this procedure should resolve the “cable doesn’t work” symptom and enable proper (GODIAG BDC2/BCP)GODIAG BDC3/BCP testing.