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Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. 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 K56 serial data gateway module, verify that a test lamp does not illuminate between the ignition circuit terminal 20 and ground.
    • If the test lamp illuminates, test the signal circuit terminal 20 for a short to voltage.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 20 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. If all circuits test normal, replace the K56 serial data gateway module.
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