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Home >> GMC >> 2013 >> Acadia Denali, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 171 (Object Detection System) >> Diagnostic Information and Procedures >> DTC B127B: Rearview Camera Input Signal >> Circuit/System Verification
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Circuit/System Verification

WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  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. Ignition ON, transmission in R.
  5. Verify the backup lamps are illuminated.
    • If the backup lamps are illuminated 
  6. Engine running, transmission in R.
  7. 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 
  8. All OK.