I have reason to believe the BCM in my 2000 LeSabre is bad. (gauges not always working; lots of wrong combinations of dash lights, radio not working; problems w/interior lights, power door locks and windows, etc.) Where is this BCM located? Do I have to tear the dashboard off to get at the BCM? I am trying to estimate how much time a dealer would have to put into it vs. doing it myself.
The first thing the dealer would do is diagnostic's . Would not guess and just replace the BCM . Hooking up the factory Tech 2 scan tool an checking for DTC'S - diagnostic trouble codes , input data to the BCM etc.
(I have reason to believe the BCM in my 2000 LeSabre is bad ???? )you have no clue ! The BCM has nothing to do with gauges , insturment cluster ! Beside's you still would need to take it to the dealer because it would need to be programmed .
Leave this to a qualified repair shop . Plus the dash doesn't need to be taken apart to replace the BCM . Your vehicle actually has three modules for the body control system .
The body control system consists of 3 modules:
• The dash integration module (DIM)
• The instrument panel module (IPM)
• The rear integration module (RIM)
You have no idea what your messing with . Your best bet ,take it to a qualified repair shop ,and that doesn't always mean you need to take it to the dealer .
Each of the 3 body control modules integrate a number of functional systems under the control of a single module. Each of the modules is connected to the Class 2 serial data line. Many control signals are implemented by Class 2 messages.
Important: The air bag indicator light may remain ON after the DIM module is replaced, and during the programming procedure for the DIM, until after the procedure is completed and the ignition key is cycled OFF and ON .
• Before replacement, record the personalization settings to transfer to the new module (if they are available).
• After replacement of the DIM, perform the following procedure.
• In order to reprogram the DIM, perform the following procedure.
Using a scan tool, preform the New VIN Procedure.
Perform the Setup SDM Serial Number in DIM Procedure.
Using the scan tool, set the Point of Sale in the DIM module to the correct country.
Using the scan tool, configure the RPO option configuration.
Perform the vehicle personalization in order to reset the owner's desired personalization settings. Refer to Instrument Cluster, Gauges and Console.
Plus power door locks and windows are controlled by door module system , not body control system .The vehicle is equipped with power door locks. Each lock actuator is powered and controlled by the door module mounted in the individual door. The driver door module (DDM) is the master control for the door lock system but the rear integration module (RIM) contains the program that determines when the lock functions are permitted.
Mess with the wrong stuff an you will render your vehicle useless
cost to much to fix.
SOURCE: fuse box location
The fuse box or panel, is located under the dash on the far left, next to the parking brake release handle. Looking in this area, you will notic a small black plastic panel. Remove this panel and you will see the fuses.
There is a second fuse panel under the hood, up against the firewall. Remove the large black plastic panel and you will find a row of relays, and a number of large type fuses.
Bill
SOURCE: Remote door lock receiver problem 1995 Buick Regal
They are right at the GM dealer, u need a new module, have seen and fixed this very issue, have the dealer do a national inventory search both in Canada and the USA, if the dealer won't, call a US dealer and ask them to try and get the part for U, have done this more than once for out of production parts, always got the part from somewhere.
SOURCE: Electrical Problem 1994 Buick Lesabre
GM usually puts the Fuse Diagram in the Back of the Owners Manual.
SOURCE: 2002 buick Rendezvous dash lights/gauges/radio go on & off
Hello, I work for a GM dealer in Texas. I have seen this issue a couple of times, on your model and several times on the Trail Blazer. That vehicle has a cassette type ignition switch, that have had some issues. It can lose one leg of the switch intermittently and cause several things to go nuts. I just looked on our service site and there are no bulletins related to the issue. If you know a tech at a dealership, have him scan the vehicle for codes and send them to me. Also ask him to check the power mode operation on the scanner, It will let you know for sure if it is a ignition switch.The switch is easy to change and costs about $35 so it is not going to break the bank. Electrical problems are difficult to diagnose at best but really hard not being there to do the testing. If you can give me any codes/ power mode info I will be better able to help you. Good Luck
SOURCE: What causes power door locks,dome lights, trunk
A heavy jolt of electricity like a mini lightening strike will cause all the above to stop working instantaneously..................sodeep
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