Gateway Module
For diagnostic scan tool access, a remote DLC is mounted under the driver side instrument panel with a harness connected to the GWM. The GWM acts as a central gateway to translate messages across all vehicle controller area networks (CANs). The GWM is the only module on this 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 remote DLC are DIAG 1 and DIAG 2. These 2 networks communicate 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 and MS-CAN to the DIAG 2 which transfers the signals to the diagnostic scan tool.