Fuse diagram Trunk won't open with keyfob or interior trunk release. Manual release works. Also, license plate lights are out. I cannot find a fuse labeled with either trunk release or license palte lights. Any suggestions?

lay the back seat down crawl into the trunk and you can release the trunk latch from the inside and while you are at it repair the latch so you can use it .. when i did that last time i installed an electric release (get the part at the junk yard) so i never had an issue again ..

In some large cars like yours you can remove the rear seat back and open a plate that gives access to the trunk. Depending on your car if it is just a small access panel you will have to go on a fishing expedition with a magnet attached to a rod of some sort to fish them out.

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From the Hayes "Cadillac CTS and CTS-V '03 thru '12" manual (the writers state that their collection of wiring diagrams is not complete and only includes the diagrams that they believe are most often needed):
-- Hayes Manual pg. 12-45: License plate lamps: purple wire from left position lamp circuit, rear fuse block mini-fuse 15 (10A). Pulling this fuse should disable license plate lamps, left-side front parking and side marker lamp, left-side tail lamp, and left-side brake and turn signal lamp.
-- Hayes Manual pg. 12-61: Trunk light: called rear compartment courtesy lamp, powered by orange wire from Body Control Module, which is powered by underhood fuse block Body Control Module 2 mini-fuse 36 (15A), and underhood fuse block Body Control Module 7 mini-fuse 69 (10A). Pulling these fuses should disable all courtesy lights (with the possible exception of front door lamps), reading lamps, sunshade lamps, and trunk latch.
Be careful. Check that the circuits are dead after you pull the fuses. The after-market manuals often have mistakes, especially presenting information from the wrong year car. Hopefully computers will not be damaged.

Open the trunk and check the wires near the right hinge. You'll probably have some cut wires that will need to get re-connected that go to your lights and trunk release.

remove the light pannel and check the sockets for corrosion and the trunk release should be in the glove box

check your ground side of the light circuit

I had this problem as well.
The wiring harness in the trunk is a bit short and some of the wires fray. when this happens, the car doesn't recognise that the fob is close by so it fails to open.
Just pull back the boot near the trunk hinge on the passanger side and look for frayed wires.

How can I adj. . a trunk light switch on a 02 Buick Century

Has it opened before? If so can you open it with the key? In the trunk is a electric solinoir at the latch, check the electrical plug for a good connection. Then try it again.

try looking at the wiring from the light and fallow it back to the fuse, sounds like a short in the wires if not change you fuse, you can find it by looking in your owners manual,