Sierra 1500 2WD V6-4.3L VIN X (2004)
Auxiliary Power Outlet: Initial Inspection and Diagnostic Overview
Diagnostic Starting Point
DIAGNOSTIC STARTING POINT - POWER OUTLETS
Begin the system diagnosis with the Diagnostic System Check - Power Outlets. 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 modules 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 - Power Outlets
DIAGNOSTIC SYSTEM CHECK - POWER OUTLETS
TEST DESCRIPTION
Steps 1-2
