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Courtesy Lights on my 1999 Buick LeSabre stay on for too long


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Mike T.
New User

Sep 14, 2013, 12:01 PM

Post #1 of 8 (524 views)
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Courtesy Lights on my 1999 Buick LeSabre stay on for too long Sign In

1999
Buick
Le sabre
3.8 Ltr. V6
136,000 Miles
My car needed to be "Jumped Off" several times over a period of a few months. I replaced the battery and terminals and had the charging system checked. It checked out OK. I noticed the Courtesy Lights (Headlights, Interiorlights Etc.) staying on longer than usual when I turned the car off so I decided to time them. They stay on for 10 Minutes after the ignition is turned off. How can I disconnect the Courtesy Lights so I don't have this problem again?


Discretesignals
Veteran / Moderator


Sep 14, 2013, 12:30 PM

Post #2 of 8 (516 views)
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Re: Courtesy Lights on my 1999 Buick LeSabre stay on for too long [In reply to] Sign In

Does this have twilight sentinel? If it does and you turn the timer all the way down, do the headlamps turn off in less time?





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Hammer Time
Ultimate Carjunky / Moderator


Sep 14, 2013, 12:51 PM

Post #3 of 8 (512 views)
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Re: Courtesy Lights on my 1999 Buick LeSabre stay on for too long [In reply to] Sign In

If your battery can't hold up to 10 minutes of courtesy lights, then you have a bad battery. I didn't see anywhere that you had that tested.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Mike T.
New User

Sep 14, 2013, 1:23 PM

Post #4 of 8 (504 views)
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Re: Courtesy Lights on my 1999 Buick LeSabre stay on for too long [In reply to] Sign In

Yes it has the twilight sensor and it is turned down all the way. That is what I thought the problem might have been to begin with, but having it all the way down doesn't effect it. Is there a way to disconnect it?


Mike T.
New User

Sep 14, 2013, 1:25 PM

Post #5 of 8 (503 views)
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Re: Courtesy Lights on my 1999 Buick LeSabre stay on for too long [In reply to] Sign In

I replaced the Battery and terminals and had the charging system checked and it checked out OK.


Discretesignals
Veteran / Moderator


Sep 14, 2013, 1:37 PM

Post #6 of 8 (499 views)
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Re: Courtesy Lights on my 1999 Buick LeSabre stay on for too long [In reply to] Sign In

HT is correct in that the lights staying on for 10 minutes shouldn't kill the battery, but that may be a sign of something that isn't shutting off. The headlamps are controlled by the lamp control module and the courtesy lamps are controlled by the body control module.

If you disconnect the lamp control module, you won't have headlamps. If you disconnect the BCM, practically everything in the vehicle won't operate.

The next thing that should be done is a parasitic draw test. That might help isolate what is staying on.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Sep 14, 2013, 1:38 PM)


Hammer Time
Ultimate Carjunky / Moderator


Sep 14, 2013, 2:28 PM

Post #7 of 8 (493 views)
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Re: Courtesy Lights on my 1999 Buick LeSabre stay on for too long [In reply to] Sign In

Here's your parasitic draw procedure.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Mike T.
New User

Sep 14, 2013, 3:43 PM

Post #8 of 8 (483 views)
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Re: Courtesy Lights on my 1999 Buick LeSabre stay on for too long [In reply to] Sign In

Thank You Both very much. I have been told that the Security System has gone off by itself when no one was around. Could that be the Culprit?
I will take it to the shop to test the BCM.Unsure


(This post was edited by Mike T. on Sep 15, 2013, 4:23 PM)




Courtesy Lights on my 1999 Buick LeSabre stay on for too long


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