[apples000]

We've had this problem quite a bit. For us it's been caused by a digital I/O or PWM connector being shorted out. You should try running the robot with nothing connected to the sidecar, then add the connections until you find the bad one. We've found that it's quite easy for the DIO cables to get damaged and short together and cause the 5V supply on the sidecar to drop out. We've also seen a very similar problem to this where all of the outputs on the sidecar drop out. This is caused by the 9403 digital module losing power. If your cRIO power connector is loose, it can cause the digital module(the part that goes in the cRIO, not the sidecar) to brown out when the rest of the cRIO doesn't.