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Class 1 Serial Data Line Diagnosis

To perform diagnosis, see Fig 1 and Fig 2 .

Fig 1: Class 1 Serial Data Line Diagnostic Flowchart (1 Of 2)
G00133096Courtesy of GENERAL MOTORS CORP.
Fig 2: Class 1 Serial Data Line Diagnostic Flowchart (2 Of 2)
G00133097Courtesy of GENERAL MOTORS CORP.
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