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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (Displays And Gauges) >> Diagnostic Information and Procedures >> DTC B15BD (in Instrument Panel Cluster Control Module) >> 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. Verify the USB cable is properly connected 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. 
  2. Disconnect the P16 Instrument Panel Cluster Control Module X2 harness connector and the P29 Head-Up Display X2 harness connector.
  3. Connect the EL-50334-50 to the P16 Instrument Panel Cluster Control Module and the P29 Head-Up Display X2.
  4. Ignition ON, Head-Up system ON.
  5. Verify the DTC does not set.
    • If the DTC sets 
    1. Replace the P29 Head-Up Display.
    2. Verify the DTC does not set.
      • If the DTC sets 

        Replace the P16 Instrument Panel Cluster Control Module.

      • Go to next step: If the DTC does not set 

        Go to next step: All OK

    • Go to next step: If the DTC does not set 
  6. Replace the USB harness.
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