Envoy 2WD V8-5.3L VIN M (2005)
Navigation System: Initial Inspection and Diagnostic Overview
DIAGNOSTIC STARTING POINT
Begin the system diagnosis with the Diagnostic System Check - Vehicle in Vehicle DTC Information. The Diagnostic System Check - Vehicle will
provide the following information:
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The identification of the control modules which command the system.
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The ability of the control modules to communicate through the serial data circuit.
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The identification of any stored DTCs and their status.
The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.
