[HdeVille]

Will the built-in Trunk Release Relay throw a code if its bad???

 

[HdeVille]

Yes, the fuse is built in, when I 12V test the test point to a ground it reads 0.2 volts(I don't know what this means or what it should read...) I also have the wiring diagram from the Factory Repair Manual that I bought on EBay. I know the colors of the wires but can't access any of them without tearing apart the harnesses or fuse panel under hood....

 

[HdeVille]

Can you post a picture of the wiring diagram that shows the relay, the test point and the trunk release?
Edit: Attached is a picture of a 2017 Trunk Release Circuit - I assume your 2018 will look similar. Made some notations on it to give you an idea of how it works - hope this helps you.
View attachment 171090

Do you think that the relay test point should always have 12 volts or only when the trunk release is activated??? Or is it an ohms test???

 

[HdeVille]

Did you guys find any solutions? I have the same issue with my 2017. Ruled out the remote, the button on the truck exterior, thr fuse and the connectors in the trunk lining.

I also replaced every part and harness in the trunk lid and can not get it working. Do you have any issues with the parking lights on the trunk lid? Does yours pop the trunk when the lights turn on???

 

[HdeVille]

Did you guys find any solutions? I have the same issue with my 2017. Ruled out the remote, the button on the truck exterior, thr fuse and the connectors in the trunk lining.

I ended up just disconnecting the trunk release latch and bridging the ground and purple wire to get the camera and plate lamps working and don't use the trunk. I'm scared of how much a dealership will want to fix it...