2010-2013 Mazda 3 & Skyactiv Audio & Electronics
Ok, so my amp powered up, but no sound. I have the stock hu and used pac oem hardness.
At first, I connect a toggle switch to remote wire so I can turn the amp/sub off when the old lady drives the car.
I had to flip the toggle switch on and off 4-5 times before the sound would come on.