Corvette V8-6.2L (2008)
Information Bus: Initial Inspection and Diagnostic Overview
Diagnostic Starting Point - Data Communications
Diagnostic Starting Point - Data Communications
Begin the system diagnosis with Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic
System Check - Vehicle) . The Diagnostic System Check - Vehicle will provide the following information:
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The identification of the control modules which are not communicating.
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The identification of any stored diagnostic trouble codes (DTCs) and their status.
The use of the Diagnostic System Check - Vehicle will identify the correct procedures to begin vehicle diagnosis. These must be performed before
system DTC or symptom diagnosis.
Data Link References
Data Link References
This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link
to communicate. Some modules may have multiple communication circuits passing through them without actively communicating on that data link. This
table is used to assist in correcting a communication malfunction. The body control module (BCM) emulates some devices that are on high speed
GMLAN serial data circuit to the modules on class 2 serial data circuit. The BCM transmits multiple Node Alive messages using source IDs that
correspond to each of those high speed GMLAN nodes. This is in addition to the BCM behaving itself as a real node. For the description and operation
of these serial data communication circuits refer to Data Link Communications Description and Operation (See: Description and Operation) .
Important: If the scan tool does not communicate with the vehicle the class two serial data bus must be diagnosed, repaired and functional first
in order to prevent misdiagnosis.
