we have done all those things that you listed correctly. for the flashing led, after 20 seconds of powering on the robot, it starts flashing in no pattern, but if we hook the robot signal light up to it that starts flashing too, so we assume it is related to that. here are some pictures of our wiring.
https://picasaweb.google.com/lh/phot...t=d irectlink
https://picasaweb.google.com/lh/phot...t=d irectlink
ps, in this image you can see the second digital side car is not powered, that was temporary and is fixed now.