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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 298 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> Windshield Wiper System Malfunction >> 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.

Windshield Wiper Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the connector at the S82 Windshield Wiper/Washer Switch.
  2. Verify a test lamp illuminates between the low reference circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Test circuit 6009 for an open/high resistance.
      • If open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If open/high resistance is not found
    2. Replace the K9 Body Control Module
    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify the scan tool Windshield Wiper Switch parameter is not High.
    • If High 
    1. Test circuit 1715 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. Replace the K9 Body Control Module
    • Go to next step: If not High 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
  6. Verify the scan tool Windshield Wiper Switch parameter is High.
    • If not High 
    1. Test circuit 1715 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. Test circuit 1715 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 High 
  7. Test for 4.8 - 5.2 V between the signal circuit terminal 3 and ground.
    • If less than 4.8 V 
    1. Test circuit 1714 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 1714 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K9 Body Control Module.
    • If greater than 5.2 V 
    1. Test circuit 1714 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 4.8 - 5.2 V 
  8. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Wiper Motor Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the KR12B Windshield Wiper Motor Relay. Ignition ON.
  2. Verify a test lamp illuminates between control circuit terminal 85 and ground circuit terminal 86.
    • If the test lamp does not illuminate 
    1. Test circuit 750 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.
    2. 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.
    3. 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.
    4. Replace the K219 Lighting Control Module.
    • Go to next step: If the test lamp does not illuminate 
  3. Verify a test lamp illuminates between terminal 30 and ground.
    • Go to next step: If the test lamp illuminates 
  4. Ignition OFF, connect the KR12B Windshield Wiper Motor Relay. Disconnect the connector at the M75 Windshield Wiper Motor.
  5. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 750 or ground connection.

    • Go to next step: If the test lamp illuminates 
  6. Ignition ON.
  7. Verify a test lamp illuminates between control circuit terminal 4 and ground.
    • If the test lamp does not illuminate 
    1. Test circuit 4947 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 4947 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 KR12B Windshield Wiper Motor Relay.
    • Go to next step: If the test lamp illuminates 
  8. Replace the M75 Windshield Wiper Motor.
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