First timer here...looking for help,of course, but have found lots of stuff already on this site that has helped me. Right now, I have a shorted horn wire. I have continuity between ground and the 'black-yellow' coming off the clock spring, and also between ground and the red-white wire in the fuse block. I should not see that as the 'make ground' on the horn relay closes the horn power circuit. I have a wiring diagram from Toyota that shows a "HORN ECU" and that is where the 'blackyellow' wire turns to 'white-red'. Where is that ECU? For the life of me I cannot find it. I know it is not engine side of the firewall.
Thanks in advance!