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Test Description

NOTE: The following numbered steps refer to circled numbers on diagnostic chart. See Fig 1 . For circuit identification, see Fig 2 .
  1. Under normal conditions, the DERM will cycle the telltale between 7 and 9 times at key ON. If this does not happen, a power, ground, or internal DERM failure is indicated.
  2. If multiple codes are present, a data line fault is indicated and should be diagnosed using the preceding multiple communication code chart.
  3. A normal data line will fluctuate voltage as data signals are sent. If the voltage does not fluctuate at the DERM connector A8, an open in CKT 800 between the DERM, IPC and PCM is indicated.
Fig 1: DTC B333: Loss Of DERM Data Diagnostic Flow Chart
G00072723Courtesy of GENERAL MOTORS CORP.
Fig 2: Identifying Loss Of DERM Data Circuit
G00072720Courtesy of GENERAL MOTORS CORP.
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