Courtesy lights interior not turning off

RRSTAMP

MEMBER
2004 CADILLAC CTS
6 CYL
2WD
AUTOMATIC
79,000 MILES

Got in the car last night and the lights would not dim out. Nothing in manual says anything about it, disconnected battery all night and still lights came back on. Took the relay out for now to keep battery from running down. What is it trying to tell me?

The slide dimmer controls the dash board lights is good. My question is about the interior /courtesy lights on the doors and map lights.

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,627 POSTS

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

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Monday, June 12th, 2017 AT 4:16 PM

AUNTTINKER

MEMBER
2 POSTS
2003 CADILLAC CTS
123,000 MILES

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?

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Monday, June 12th, 2017 AT 4:17 PM (Merged)

RIVERMIKERAT

MECHANIC
6,110 POSTS

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.

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Monday, June 12th, 2017 AT 4:17 PM (Merged)

JMMO13

MEMBER
1 POST
2003 CADILLAC CTS

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

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Monday, June 12th, 2017 AT 4:17 PM (Merged)

GMTECH

MECHANIC
537 POSTS

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.