A guess from the dark .. my guess is to reverse the 2 wires from aswci to the HU ..
Somewhere the wiring is not correct .. do you have Retained power supply confirmed ..if not you will need to access a Retained power supply for the HU ..................................
Somewhere the wiring is not correct .. do you have Retained power supply confirmed ..if not you will need to access a Retained power supply for the HU ..................................