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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 >> Hazard Lamps Malfunction >> 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, scan tool disconnected, all doors closed, all accessories OFF, open and close drivers door, disconnect the connector at the S26 Hazard Warning Switch.
  2. Verify a test lamp illuminates between terminal 5 and ground.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on the circuit or ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition ON, momentarily connect a 3 A fused jumper wire between signal circuit terminal 11 and ground.
  4. Verify the hazard lamps turn ON.
    • If the hazard lamps do not turn ON and the 3 A fuse is OK 
    1. Test circuit 111 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 111 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 hazard lamps do not turn ON and the 3 A fuse is open 
    1. Test circuit 111 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 hazard lamps turn ON 
  5. Replace the S26 Hazard Warning Switch.
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