How do you replace bcm in 2000 deville?

To replace the Body Control Module (BCM) in a 2000 Cadillac DeVille, first disconnect the negative battery cable to prevent electrical shorts. Remove the trim panels to access the BCM, typically located under the driver's side dashboard. Disconnect the connectors from the old BCM, remove it from the mounting bracket, and install the new BCM by reversing the process. Finally, reconnect the battery and ensure the new module is programmed if necessary.