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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 298 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> DTC B198B >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT5. 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 KR12B Windshield Wiper Relay. 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 86 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance in circuit 750 or the ground connection

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON/Vehicle in Service Mode.
  4. Verify a test lamp turns illuminates between control circuit terminal 85 and ground circuit terminal 86.
    • If the test lamp does not illuminate 
    1. Test circuit 91 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 91 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 turns illuminates 
  5. Test or replace the KR12B Windshield Wiper Relay.
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