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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the SDGM harness connector X2 at the SDGM, verify that a test lamp does not illuminate between the ignition circuit terminal 20 and ground.
    • If the test lamp illuminates, test the signal circuit terminal 20 for a short to voltage.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 20 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. If all circuits test normal, replace the SDGM.
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