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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the X50A underhood fuse block.
  2. Disconnect the X4 harness connector at the K9 BCM.
  3. Ignition OFF, test for less than 5 Ω between the signal circuit terminal 60 at the X50A underhood fuse block and the signal circuit terminal 14 at the K9 BCM.
    • If the value is greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the K9 BCM.
  4. If all circuits test normal, test or replace the X50A underhood fuse block.
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