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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 226 (Data Communications System) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with High Speed GMLAN Device >> Circuit/System Testing >> Testing the DLC Serial Data Circuits for an Open
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Testing the DLC Serial Data Circuits for an Open

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 harness connectors at the body control module (BCM).
  2. Test for less than 2 Ω on each serial data circuit between the DLC and the BCM.
    • If greater than the specified range, test the circuit for an open/high resistance.
  3. Test for less than 2 Ω on each serial data circuit between the BCM and the first splice or splice pack.
    • If greater than the specified range, test the circuit for an open/high resistance.
  4. If the circuits test normal, replace the BCM.
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