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Home >> Buick >> 2017 >> Envision Essence, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Object Detection System And Pedestrian Protection System >> Diagnostic Information and Procedures >> DTC B127B: Rearview Camera Input Signal Circuit Missing Reference >> Circuit/System Verification
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Circuit/System Verification

    NOTE:

    If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.

  1. Ignition ON.
  2. Verify that DTC B2545 is not set.
    • If the DTC is not set 
  3. Verify the rearview camera has no debris on the lens and that the bezel and bezel seal are not damaged.
    • If debris is found on the lens 

      Clean the lens. If the lens, bezel, or bezel seal are damaged, replace as necessary.

    • If no debris on the lens 
  4. Engine running, parking brake applied, transmission in R.
  5. Verify the backup lamps are illuminated.
    • If the backup lamps are illuminated 
  6. Engine running, parking brake applied, transmission in R.
  7. Verify a clear rear vision image is displayed on the K48 Infotainment Faceplate Control Module.
    • If a clear image is not displayed 

      Refer to Circuit/System Testing.

    • If a clear image is displayed 
  8. All OK.
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