Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome to justanswer.
The proper way to check for parasitic draw on the battery is with an ammeter. Follow the procedure below to narrow down which circuits/components are causing the draw.
Is it fuse #3 in the panel below?
Attachments are only available to registered users.
And fuse #7 in the panel below?
These fuses both supply current to the lighting circuits and the sum of the amperage draw may not be equal to the sum of both circuits because they may feed some of the same components.
The door switches are built into the door latch on this vehicle.
If you can verify that these are the two fuses you are indicating then I can give you some other fuses to pull to help narrow down the problem.
Fuse 7 feeds two other fuses in the relay center. The relay center is under the dash on the passenger side. See diagrams and pictures below.
Try disconnecting the remote door lock module (RAC module in picture below) to see if the power draw goes away. This module may be turning on the courtesy light relay.
Here are four diagrams showing all of the courtesy lamp circuits. Note that there are some differences depending on whether your Lesabre is a Limited or Custom series.
Dave, I found the problem. It was the interior lamp dimmer. When the dimmer is all the way bright (MAX). the draw was 170 mA. When the dimmer is off of max 1/4" from max the draw is 12 mA. Instead of tearing into the dash and fixing the controller. I decided to stop it from hitting max by using match stick as a stop. Hard to find. Simple fix. I noticed that one of the diagrams indicated the dimmer. Thanks for your help. This vehicle has been sitting for over 6 months because of this.