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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1952 (Lighting System) >> Diagnostic Information and Procedures >> DTC C0297 >> Circuit/System Testing
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Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 harness connector at the ECM.
  2. Connect a test lamp between the appropriate signal circuit terminal listed below and ground:
    • Terminal 7 - with HP2
    • Terminal 9 - without HP2
  3. Ignition ON, turn the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the selected states.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the ECM.
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