Air ride issues

My front passenger side air bag does not inflate. I have looked over the hoses and they seem to be fine. The compressor comes on and inflates the driver's side.
I have found the height sensor (the one that clips on to the ball and commonly comes lose) on the driver's side, but cannot seem to locate one on the passenger side. It might be missing? Cannot find a decent diagram to know for sure.
Is there a way to manually test if the shock holds air?
Can you bleed it without removing it completely?