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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Lighting System - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC C1304 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, the X5 connector at the K219 Lighting Control Module.
  2. Connect a test lamp between signal circuit terminal 7 and ground, ignition ON:
  3. Verify the test lamp turns ON and OFF while pressing and releasing the brake pedal.
    • If the test lamp is always OFF 
    1. Test circuit 6311 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Test circuit 6311 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    3. Replace the K9 Body Control Module.
    • If the test lamp is always ON 
    1. Test circuit 6311 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  4. All OK, a fault is not currently present and may be an intermittent condition.
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