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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 connector at the EBCM.
  2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals listed below and ground:
    • Terminals 16
    • Terminals 45
    • If greater than the specified range, test the ground circuits for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminals listed below and ground.
    • Terminal 2
    • Terminal 31
    • If the test lamp did not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
  4. If the circuits test normal, replace the EBCM.
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