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In a 2003 Chevy Impala, the body control module is situated under the center console. You can access it by removing the console paneling and then detaching the top of the console from the vehicle. Inside, you will find a black plastic box with multiple wire harnesses plugged in. This is essentially a computer that manages various functions within the car's body, such as the locks, power windows, and alarm system. If you experience any issues with these systems, it is recommended to utilize a scan tool on the body control module to identify potential computer malfunctions.
Magdalena M. clarified on April 9, 2020 that the Body Control Module (BCM) is situated beneath the dashboard on the driver's side. It has two gray plugs and one pink plug for connections.
Mag is mistaken. The fuse box is located beneath the dashboard on the driver's side. I mistakenly removed the console following Mag's instructions, only to find out it was unnecessary.
The Body Control Module (BCM) is situated beneath the center console, in the space between the seats. Removing the console is necessary in order to gain access to the BCM.