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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System And Navigation System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B128B: Video Display Output Signal - Signal Amplitude >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify no other DTCs are set.
    • If no other DTCs are set. 
  3. Ignition ON, rear seat entertainment system ON, sourced to front display.
  4. Verify rear display turns on with the system.
    • If the screen does not turn on 

      Refer to Circuit/System Testing

    • If screen turns on with the system. 
  5. All OK.
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