I've been pinging a bunch of forums trying to see if anyone has seen anything like this. I went out to start my truck the other day, and got a no crank condition. Theft light is flashing at me, and it says "CHECK BRAKE SYSTEM" "TRAILER BRAKE MODULE FAULT" Won't even let me shift into neutral to roll down my driveway. What's weird is my MiniMaxx buttons aren't working. I've already checked the pertinent fuses to no avail. I have the shop manual, and the pinpoint test for no scanner communication with the TBC seems to indicate that it's a bad TBC. I've tried leaving the Mini disconnected when starting, and it doesn't seem to make a difference. I did leave the batteries unplugged overnight, and it started up normal, but this morning, it's all locked up again. I have noticed that the TBC display no longer lights up when I turn the key on, and it does have key-on power at the plug. Has anyone seen anything like this or had a TBC go bad? I don't want to buy a $300 TBC if that's not the issue.
I've tried unplugging it with no luck. I was getting the "Trailer Wiring Fault" message when it rained because the cover to the plug was broken off, but I removed the trailer plugs entirely to eliminate that possibility. I can't find anyone who's had these exact symptoms
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