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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 224 (Lighting System - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC B19A1 or B19A2 >> 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.

DTC B19A1

  1. Ignition OFF, disconnect the X5 connector at the K219 Lighting Control Module, ignition ON:
  2. Verify the E42L Rear Body Structure Stop Lamp - Left is not illuminated.
    • If park lamp is illuminated 

      Repair the short to voltage on circuit 6993.

    • Go to next step: If the park lamp is not illuminated 
  3. Connect a 3 A fused jumper wire between B+ and terminal 6 at the X5 connector:
  4. Verify the park lamp is illuminated.
    • If the park is not illuminated and the jumper fuse is OK 
    1. Test circuit 2550 for an open/high resistance:
      • If an open/high resistance is found, repair the fault on the circuit or ground connection.
      • Go to next step: If an open/high resistance is not found.
    2. Test circuit 2550 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 E42L Rear Body Structure Stop Lamp - Left.
    • If the park lamp is not illuminated and the jumper fuse is open 
    1. Test circuit 6993 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 E42L Rear Body Structure Stop Lamp - Left.
    • Go to next step: If the park lamp is illuminated 
  5. Replace the K219 Lighting Control Module.

DTC B19A2

  1. Ignition OFF, disconnect the X5 connector at the K219 Lighting Control Module, ignition ON:
  2. Verify the E42R Rear Body Structure Stop Lamp - Right is not illuminated.
    • If park lamp is illuminated 

      Repair the short to voltage on circuit 6995.

    • Go to next step: If the park lamp is not illuminated 
  3. Connect a 3 A fused jumper wire between B+ and terminal 2 at the X5 connector:
  4. Verify the park lamp is illuminated.
    • If the park is not illuminated and the jumper fuse is OK 
    1. Test circuit 1650 for an open/high resistance:
      • If an open/high resistance is found, repair the fault on the circuit or ground connection.
      • Go to next step: If an open/high resistance is not found.
    2. Test circuit 6995 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 E42R Rear Body Structure Stop Lamp - Right.
    • If the park lamp is not illuminated and the jumper fuse is open 
    1. Test circuit 6995 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 E42R Rear Body Structure Stop Lamp - Right.
    • Go to next step: If the park lamp is illuminated 
  5. Replace the K219 Lighting Control Module.
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