[JasonACT]

Hard to say, but maybe/probably. There is one input that should always be sent to the amp, the SAT NAV. I connected up a tiny speaker (it's the round thing above the LCD in the first picture) to the SAT NAV output of the screen and I can just hear the voice commands in the demo. But when it's connected to the radio board, with code error showing, it doesn't produce any sound other than the hiss. Grounding all inputs doesn't make the hiss go away. With a floating input, you can generally hear tiny changes in the amp's output - but there are none in this unit. It's like it's designed to output white noise!