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Scan Tool Does Not Communicate With A System Module

Refer to flowchart for diagnostic procedure. See Fig 1 and Fig 2 .

Fig 1: Scan Tool Does Not Communicate With A System Module Diagnostic Flowchart (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Scan Tool Does Not Communicate With A System Module Diagnostic Flowchart (2 Of 2)

Courtesy of GENERAL MOTORS CORP.