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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the K67 trailer brake control module.
  2. Connect a test lamp between the signal circuit terminal 14 and ground.
  3. Ignition ON, command the Center Brake Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF while changing between the commanded states.
    • If the test lamp is always ON, test the signal circuit for a short to voltage.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the K67 trailer brake control module.
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