Question about 1998 Buick LeSabre

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I have a 98 lesabre custom, and just 2 days ago, the power door locks stopped working, and the dome light quit all at the same time... if you push the keyless entry fob, the lights flash and horn honks. Also if you close all the doors and push the lock/unlock button on the doors, there is a loud chatter behind the glove box. I have already replaced the power lock relay hoping that would fix it, but it hasnt... i have checked all the fuses that i could find under the hood, drivers side and behind the glove box and havent found any blown... anyone have any ideas on where I can start?

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  • adam pranger May 23, 2011

    I have already pulled every fuse and checked them all with my little tester thing, all are fine... for the hell of it, i replaced every single one.
    This bcm.. would that me the thing that is doing the loud fast clicking/vibrating thing.. I have no idea what this part that i found is that is making all the chatter when I push the lock unlock button on the door, but it is behind the glovebox... its a rectangle like box with 2 sets of wiring harnesses going into it... it has an orange label and has a bar code on it, but since the vacume lines and stuff are right there im not about to try and rip it out and see what it is or does... thanks!

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  • Buick Master
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Hello
The problems you are having are monitored and controlled by a central electronic module in this car called the "BCM" (Body Control Module) whenever there is a system malfunction a code is set in the module to identify the section of the body electronics that needs diagnosis/testing. So the very first step in diagnose and repair of any problem like this is to have the GM dealer test the BCM for "B" series fault codes, "B" is for body and there are about 100 such fault codes. This testing requires a special electronic system scanner called a TECH II, or it equivalent that is made by Snap-on tools and other major professional tool manufacturers. The scanner is very expensive about $1500.00 so have the test run is really the only option, but you must have the BCM test run to even begin to understand the problem here. I am sorry but there is very little a laymen can do to fix this type of problem, you need the scanner and then a set of factory service manuals to understand how to diagnose what the scanner turns up in memory as body fault codes.

Posted on May 23, 2011

  • yadayada
    yadayada May 23, 2011

    The BCM controls the relay that is making noise, so we are back to testing and diagnosing the BCM and its systems of control.



    This is from the factory service manual for a 1998 Lesabre:

    System Description

    The Body Control Module (BCM) diagnostic system check is an organized approach to identify problems associated with the BCM. The BCM diagnostic system check must be the starting point for any BCM-related complaint.

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  • Buick Master
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Recheck the fuses on the drivers side, under the hood and on the passenger's side.Remove the fuse out and check visually, test it with continuity tester.Many a times fuse looks good but when you test it with continuity tester it checks out faulty.Remove all the fuses one by one and check and reinsert.
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Disconnect the battery wire for a minute then reconnect and check.Also check wire harnesses behind the glove box on the passenger's side , if any of the wire is getting loose or if any two wires getting in contact with each other or any metal surface then it shorts.So lift the wires one by one and check visually.There might be loose or cut in any wire causing this.
------------ If all this checked ok, then it can be the problem with body control module.Its called BCM. The BCM is located Inside the car, passenger side, under the glove compartment.Under Right Side Of Instrument Panel, Near Glove Compartment .----------- It has to be checked and replaced.--------- This should help.thanks.Helpmech.

Posted on May 23, 2011

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