Gateway Module
The GWM is mounted under the driver side instrument panel. The OBD connector is fitted to the GWM. The GWM acts as a central gateway to translate messages across all vehicle controller area networks (CANs), and vice versa. The GWM is the only module on the vehicle with this ability. The GWM also serves as a termination module for each of the networks to which it is connected.
The 2 module communication networks connected to the DLC are DIAG 1 and DIAG 2. These 2 networks communicate directly with the diagnostic scan tool. The other communication networks, communicate on the network, but do not communicate directly with the diagnostic scan tool. The GWM translates the messages from the HS-CAN1 to DIAG 1. The GWM translates messages from the HS-CAN2, HS-CAN3, HS-CAN4 (if equipped) and MS-CAN to DIAG 2 which transfers the signals to the diagnostic scan tool.