I have checked the head unit it has the silver *****, and found the amp, nothing was plugged into the amp Q3 infinity, and there is a black siemens unit next to it, not sure if this standard or is some kind of replacement amp.

The connectors for the Q3 were unplugged and a lot of the cables coming from the connectors were cut, not sure if this is standard but assume not.

Plugging in the connectors to the Q3 does not change the situation