courtesy lights interior not turning off

Hello,

Usually this is a problem with one of the door switches signaling an open door even when they are closed. This will require some testing at the switch wiring input. Here is a guide to help you do some testing along with the wiring diagrams.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester


You can also test the headlight switch as well.

Please let us know what happens, we are interested to see what it is.

Cheers, Ken

They are coming on whenever they want, are'nt they suppose to come on at any time i start my car? when i start my car the daytime lights were coming on automatically at any time i start my car, now they might come on or they may not, what can be causing this problem???

Check the grounds.
Check the DRL relay in the underhood relay box.
I have included magnified screenshots of the pertinent sections of the wiring diagrams.

Interior problem
2003 Cadillac CTS 6 cyl Two Wheel Drive Automatic

i was trying to replace the mirror in the sunvisor and i shorted out the interior lights ive replaced the sun visor and checked the fuses. could it be the rheostat and if so where do i find it. please help its dark inside my car

Did you make sure after shorting out the wiring that you don't still have the wiring pinched in some way. Usually the fuse would blow. If not, try power the system down by disconnecting the battery and touching the 2 cables together for 30 seconds and then reconnecting.