K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
Navigation System: Initial Inspection and Diagnostic Overview
Diagnostic Starting Point - Navigation System
Begin the system diagnosis with the Diagnostic System Check - Navigation System. The Diagnostic System Check will provide the following
information:
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The identification of the control module(s) which command the system
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The ability of the control module(s) to communicate through the serial data circuit
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The identification of any stored diagnostic trouble codes (DTCs) and their status
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
Diagnostic System Check - Navigation System
TEST DESCRIPTION
Steps 1-2