LEMON Manuals: Even more car manuals for everyone
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 B1AAD >> 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, disconnect the X5 connector at the K219 Lighting Control Module.
  2. Verify the courtesy lamps are not illuminated:
    • A24D Door Handle Assembly - Driver Exterior
    • A24LR Door Handle Assembly - Left Rear Exterior
    • A24RR Door Handle Assembly - Right Rear Exterior
    • A24P Door Handle Assembly - Passenger Exterior
    • If the courtesy lamps are illuminated 

      Repair the short to voltage on circuit 4733.

    • Go to next step: If the courtesy lamps are not illuminated 
  3. Connect a 3 A fused jumper wire between B+ and terminal 1 at the X5 connector.
  4. Verify the courtesy lamps are not illuminated:
    • A24D Door Handle Assembly - Driver Exterior
    • A24LR Door Handle Assembly - Left Rear Exterior
    • A24RR Door Handle Assembly - Right Rear Exterior
    • A24P Door Handle Assembly - Passenger Exterior
    • If the a courtesy lamp is not illuminated and the jumper fuse is OK 
    1. Test the appropriate ground circuit for an open/high resistance:
      • A24D Door Handle Assembly - Driver Exterior - 2150
      • A24LR Door Handle Assembly - Left Rear Exterior - 2350
      • A24RR Door Handle Assembly - Right Rear Exterior - 2450
      • A24P Door Handle Assembly - Passenger Exterior - 2250
      • 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 4733 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 appropriate courtesy lamp.
    • If a courtesy lamp is not illuminated and the jumper fuse is open 
    1. Test circuit 4733 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 appropriate courtesy lamp.
    • Go to next step: If the courtesy lamps are illuminated 
  5. Replace the K219 Lighting Control Module.
scientia non olet · About LEMON Manuals