FMI 637 CAT Fault Code

Cause :

This sub type is used for control module Internal Failures that cannot be assigned to a specific sub type.If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.