Circuit/System Description

The devices connected to the gateway expansion high speed GMLAN serial data circuits (circuit numbers 3935 & 3936) monitor for serial data communications during normal vehicle operation. The K56 Serial Data Gateway Module acts as the gateway module between devices on primary high speed GMLAN bus and devices on gateway expansion high speed GMLAN bus. The gateway expansion high speed GMLAN serial data bus uses terminating resistors that are in parallel with the gateway expansion high speed GMLAN (+) and (-) circuits.