Gateway Modules
WARNING: This page is about a different car, the 2015 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
The GWM is mounted under the driver's side instrument panel. The GWM acts as a central gateway to translate messages for the 3 high speed vehicle CAN networks, and vice versa. It acts as a gateway for messages on the Electric Vehicle (EV) High Speed CAN to the other 2 High Speed CAN.
The BCM is also a gateway module. The BCM translates messages on the High Speed CAN to the Medium Speed CAN and vice versa. This allows a message to be distributed throughout all applicable networks.
The BCM and GWM are the only modules on this vehicle that have this ability.