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Circuit/System Testing

  1. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
  2. Connect a test lamp between the harness connector terminal 27 and battery voltage.
  3. Ignition ON, command the horn ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always OFF, test the horn relay control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If the test lamp is always ON, test the horn relay control circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the underhood fuse block.
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