Here is my personal experience and hope that it helps. I have a 2019 GMC 1/2 Ton so I can't say for sure on other trucks. Plug in the camera and turn on the truck and it will show up on your screen. You do not need a trailer plugged in. I unboxed mine at the dealership and plugged it in without a trailer to make sure that it was working. If it is not working there are a couple of things to check. First make sure that there is a "wire" plugged into the back of the camera port of the bumper plug. If not it is likely taped to the wiring harness near there. If there is a "wire" plugged in
Just had the same issue yesterday. It is water. But it is draining down the side of the motor and landing on the exhaust crossover tube. So it drips and sizzles on the exhaust and sounds like it is spraying under force. Took it to the dealer and he said it was fine. I know that it is not. There must be a condensate drain tube plugged and backing up or something.
As soon as you plug in the camera it should show up on your screen. It may not show up in the "see-thru" mode but you will see something. So I would check that out first. I hate to see you go to all of the work installing it on the trailer and it still does not work. When I did this (I have a 19) I found that you had to really secure the camera cable to the bumper plug. When I initially did it I didn't have a picture. I had to go to the back side of the bumper and push both cables together.
I have the trailer camera package in a GMC. You could not get the trailer camera package and the technology package together so I got the trailer camera package, not knowing fully what the difference is between the two. Now that I have it I believe here are the differences. When you get the trailer camera package you give up the front camera that you would have on the technology package. So your surround view camera shows a 270-degree view. The technology package shows a 360-degree view. Both packages have the cameras in the mirrors along with a camera for the hitch. The technology pack
Maybe I didn't understand your question. When you order the truck you can't order the trailer camera package with the technology package, you have to chose one or the other. The trailer camera package does not have a front camera but does have a provision for an accessory camera that you can install on the back of your trailer. I don't know if you can install a rear trailer camera on a truck that has the technology package.
Dennis, thanks again for your help! With your information I was able to find a truck at the Dealer that had the correct trailer connector. The sales person was skeptical even though my truck and his truck was equipped exactly the same. So I went to the Service department and they contacted the Factory. The Factory said that it must have left the Factory with the wrong trailer connector so they sent out the correct one. It was installed today!
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