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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 harness X1 harness connector at the K9 BCM.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal listed below and ground:
    • B+ circuit terminal 3
    • B+ circuit terminal 4
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the harness X1 harness connector at the K9 BCM.
  4. Disconnect the inline harness connector at the appropriate E4 headlamp-low beam listed below:
    • E4G headlamp-left low beam X115 inline harness connector
    • E4F headlamp-right low beam X116 inline harness connector
  5. Connect a test lamp between the control circuit terminal G and ground.
  6. Ignition ON, command the low beam lamps 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 control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM
  7. If all circuits test normal, replace the headlamp bulb or the headlamp.
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