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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> Low Washer Fluid Indicator 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 and all vehicle systems OFF, disconnect the connector at the B118 Windshield Washer Solvent Container Level Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Verify a test lamp illuminates between the ground circuit terminal 2 and B+.
    • If test lamp does not illuminate 

      Repair the open/high resistance on circuit 850 or ground connection

    • Go to next step: If test lamp illuminates 
  3. Ignition ON.
  4. Verify a test lamp illuminates between control circuit terminal 1 and ground circuit terminal 2
    • If test lamp does not illuminate 
    1. Test circuit 185 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 185 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 K219 Lighting Control Module.
    • Go to next step: If the test lamp illuminates 
  5. Test or replace the B118B Windshield Washer Solvent Container Level Sensor.
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