How do replace body control module on Chevy Avalanche?

To replace the body control module (BCM) on a Chevy Avalanche, first disconnect the negative battery cable to prevent any electrical shorts. Remove the necessary trim panels to access the BCM, typically located under the driver's side dashboard. Unplug the connectors from the old BCM, remove it from its mounting position, and install the new BCM by reversing the removal steps. Finally, reconnect the battery, and ensure to reprogram the new BCM if required for proper vehicle operation.