Test A: Scan Tool Does Not Communicate With Class 1 Serial Data Line

Refer to flowchart. See Fig 1 and Fig 2 .

Fig 1: Scan Tool Does Not Communicate With Class 1 Serial Data Line (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Scan Tool Does Not Communicate With Class 1 Serial Data Line (2 Of 2)

Courtesy of GENERAL MOTORS CORP.