LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2019 >> CTS Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 130 (Image Display Camera System) >> Diagnostic Information and Procedures >> DTC B124B >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the X20 Memory Card Receptacle.
  2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • Go to next step: If the test lamp illuminates 
  4. Verify the USB cable is properly connected at all components and in-line connections, and there is no damage to the cable or connections.
    • If connection problems or cable damage is noted. 

      Perform the appropriate repair or replacement to correct any issues.

    • Go to next step: If no connection problems or cable damage is noted. 
  5. Connect the EL-50334-50 to the memory card receptacle connector X1 and the performance data recorder connector X5.
  6. Ignition ON, performance data recorder system ON.
  7. Verify the memory card receptacle operates properly while operating the performance data recorder system.
    • If memory card receptacle does not operate properly 
    1. Replace the X20 Memory Card Receptacle.
    2. Verify the memory card receptacle operates properly while operating the performance data recorder system.
      • If memory card receptacle does not operate properly 

        Replace the K161 Performance Data Recorder.

      • Go to next step: If memory card receptacle operates properly 

        Go to next step: All OK

    • Go to next step: If memory card receptacle operates properly 
  8. Replace the USB harness.
scientia non olet · About LEMON Manuals