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Home >> GMC >> 2017 >> Canyon SL >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> 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 there is no debris on the B87 Rearview Camera 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 there is no debris on the lens 
  3. Engine running, transmission in R.
  4. Verify the backup lamps are illuminated.
    • If the backup lamps are illuminated 
  5. Engine running, transmission in R.
  6. Verify a clear rear vision image is displayed on the P17 Info Display Module.
    • If a clear image is not displayed 

      Refer to Circuit/System Testing.

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