Initial Inspection and Diagnostic Overview

Diagnostic Starting Point - Roof

Begin the system diagnosis with Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview). The diagnostic system check - vehicle will provide the following information:

* The identification of the control modules which command the system
* The ability of the control modules to communicate through the serial data circuit
* The identification of any stored diagnostic trouble codes (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.