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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 DR UNLATCH (LIMO) relay at the rear fuse block.
  2. Ignition ON, transaxle in Park, verify that a test lamp illuminates between the control circuit terminal 8 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. If the circuit tests normal, test or replace the DR UNLATCH (LIMO) relay.
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