Hi all. New here so I hope this is the right place to post. I have a Pioneer slimline subwoofer installed TS-WX130DA. It has been working mostly fine, every now and then would not come on but would be ok after hitting the reset switch. Now it doesn't work at all.
First step in troubleshooting was to check the unit is getting power. It has a power connector with ground lead (black), permanent 12v (yellow) and switched 12v via the ignition (blue). This is where I stopped troubleshooting. If I measure voltage with the plug disconnected, everything is fine. As soon as I plug it in to the subwoofer, the permanent 12v drops to 2v and then gradually increases over time up to 12v but the unit doesn't power on. If I switch on the ignition, the blue comes on at 12v, and the yellow drops to 2v and stays there.
I tried adding an extra ground lead to the connector and that didn't help, there is continuity between the ground connector and a metal part of the body, measured ~8 ohms between the connector and the door latch.
Is the unit cooked? It just seems weird that the voltage drops that much, I can't imagine where the current is going...