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Most stock receivers do not have a dedicated amp remote lead and your 2004 Corolla is no exception.
The amp remote can be connected to any switched and fused 12V + source including the OEM receiver accessory wire which is the gray wire in your receiver harness.
Check the zener diodes over by the fuses, where the 2 chokes or load coils are. TThere are 3 or 4 Of the diodes, they are zener diodes. I had the same problem and found it to be one bad zener diode. Check my solution out on the 7202, same thing.
I have found the problem to my Kenwood KAC-7202. The amps fan was the only thing that would come on thats it. So I started checkin zener diodes cause all transistors checked out fine. So I remember readinf about a guy that had same problem and took it to a shop and they said it was some diodes. Well, thats what I was thinkin or the transformer. It turned out that 1 zener diode was no good, diode D9 1ss133. I took a zener out of an old vcr I use for parts and put it in and the fan came on as usual then the red light. Then I hooked my mp3 player to the rca input and hooked up some speakers and it works great. Hope this helps you other guys with the same problem. Check your zener diodes with a digital volt meter, if you get any measurement other than the reverse impedance which will read between 600 and 1200 ohms some lower or higher and then reverse the leads on your meter and if you get any reading it's no good and the reading will be 0-50 cause mine read 047 ohms.
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