How do you reset bcm?

To reset the Body Control Module (BCM) in a vehicle, first disconnect the negative battery terminal and wait for about 10-15 minutes. This allows any residual power to drain, effectively resetting the BCM. After that, reconnect the battery terminal and start the vehicle to see if the BCM has reset. If issues persist, you may need to use a diagnostic tool to perform a more thorough reset or reprogramming.