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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connectors at the BCM.
  2. Ignition OFF, test for less than 3.0 ohms between the ground circuit terminal 9 X4 and ground.
    • If not within the specified range, test the ground circuit for an open/high resistance.
  3. Ignition On, verify a test lamp illuminates between the B+ circuits terminals listed below and ground.
    • Terminal 3 X3
    • Terminal 10 X4
    • If the test lamp did not illuminate, test the appropriate B+ circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the BCM.
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