Two weeks ago I went into the system and turned off my backup camera alarm, now it just doesn't work, I get a warning that it isn't working, I go to the screen and try to check it on, but it doesn't check, any answers out there?
You should be able to do this without the engine running. If you can't, at least chock the wheels. I know it should go without saying, but some people.....Sometimes those one of those sensors will go out.
If you put the truck in reverse with the emergency brake on(assuming your emergency brake works correctly) and walk back there and put your ear right in front of each of the sensor they click if they're working.
At least I think that's how it is. I could have it backwards and the broken one clicks. It's still early for me. Either way, you should be able to isolate it. I doubt more than one is messed up.