BMW E38 Rear View Camera installation

Hello

I got the relay switching from bimmernav.com

Same as the one you got in the pictures.

Installed everything as describe:

87= Yellow (connected to ground chassis)

85=Red (connected to ground chassis)

30= Blue (to blue connector pin #17 video module)

86=White (to reverse 12+ wire in the tail light)

The RCA cable to the pins #13 (power input) and #14 (ground input) of the white plug (video module)

However when I put the car in reverse the screen turns black; like if the camera was not connected, but I check the camera with my camera security tester and it is video coming through.

And then when I plug and unplug the connector from the TV video module it works one time and them does not work.

Any ideas what could be the reason?

Best regards

Rey