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Test Description

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The number below refers to the step number on the diagnostic table.

  1. 6.  The module which was not communicating on the class 2 serial data circuit may have set Loss of Communication DTCs for those modules that it was monitoring.
Fig 1: DTC U1001-U1254 Diagnostic Procedure (Step 1 To 3)
G01457276Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC U1001-U1254 Diagnostic Procedure (Step 4 To 8)
G01457277Courtesy of GENERAL MOTORS CORP.
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