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The 2003 Buick LeSabre does not have a single body control module (BCM); rather, it is comprised of three separate modules that work together in the body control system (BCS). These three modules are the dash integration module (DIM), the instrument panel module (IPM), and the rear integration module (RIM). While their names may give an idea of their functions, each module has specific roles within the system. It is not recommended to try to diagnose a faulty module on your own, as this task is best left to a professional mechanic. Instead of randomly replacing modules at a high cost, it's more effective and cost-efficient to have the issue accurately diagnosed by a professional technician.
To reach the body control module below the right side of your car's dashboard, you'll have to take off the trim on your 2003 Buick LeSabre.