IC Network Messages

The IC  uses input messages from other modules to control the gauges, informational indicators, and warning indicators over the communication networks. If a required message is missing or invalid for less than 5 seconds, the gauge or indicator that requires the message remains at the last commanded state based upon the last known good message. For example, if the Overdrive (O/D) off status message is missing for less than 5 seconds and the O/D  off indicator was on (O/D  cancelled), the indicator remains in the on state until the next good message is received. If the message remains missing or invalid for more than 5 seconds, the IC  sets a U-code DTC and the output becomes a default action for the indicator or gauge. Each indicator or gauge utilizes a different default strategy depending on the nature of the indication. Refer to the normal operation descriptions located before each individual pinpoint test for further description of the default action specific to each indicator or gauge. If the messaged input to the IC  returns at any time, the normal function of the gauge or indicator resumes.