[Kevin Sevcik]

The Jaguar lights changing from blinking to solid yellow is fairly persuasive that the signal wiring is functioning correctly. They need a solid neutral signal from the controller before you get a solid light out of them. I wouldn't focus much on the physical connectivity aside from verifying that your sidecar is plugged into the slot your program is addressing.

This sounds rather more like a programming problem of some sort or another. I'd look into that first and make sure your program is loading properly and doing what you expect it to.