Circuit Description

A serial data communications system is used on these vehicles to allow various modules to communicate and share information with each other. Each bit of information has 2 lengths, long or short. This allows vehicle wiring to be reduced and the transmission and reception of multiple signals over a single wire. The messages carried on a Class II serial data streams are also prioritized. If two messages attempt to establish communications on the data line at the same time, the message with a higher priority will continue. The message with a lower priority will wait. DTC will set when a module cannot respond to the PCM with ignition on, system voltage greater than 8.2 volts and PCM cannot communicate with BCM for longer than 5 seconds.