Yes i have this setup, i tried a head unit off ebay but same result... debating now if i should try another oneDo you happen to have a BluLogic system? If so, you will have a button on the dash like in the photo below. This system bypasses the head unit and goes directly to the front speakers. So the head unit could be defective.
He said the head unit could be defective....He said that the above system bypasses the headunit. So you replaced the headunit for nothing...
Im glad i didnt chase down the amp in the backObscure are Toyota's ways...