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Test Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2. By disconnecting the VCU you can check the 3 wire bus supply and carrier voltages supplied by the VIU.
    Fig 1: DTC U1500 Diagnostic Table (1 Of 2)
    G01503424Courtesy of GENERAL MOTORS CORP.
    Fig 2: DTC U1500 Diagnostic Table (2 Of 2)
    G01503425Courtesy of GENERAL MOTORS CORP.
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