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Home >> Chevrolet >> 2025 >> Trailblazer ACTIV, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Image Display Camera System >> Diagnostic Information and Procedures >> Rear Vision Camera System Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: X5 @ A11 Radio
  3. Wait for greater than 5 s.
  4. Connect appropriate EL-52552 pinout tool to A11 Radio
  5. Ignition - On / Vehicle - In Service Mode
  6. Test for 7 to 11 V between the test points: Signal circuit terminal @ A11 Radio & Ground (component side)
    • If not between 7 and 11 V 

      Replace the component: A11 Radio

    • Go to next step: If between 7 and 11 V 
  7. Ignition/Vehicle & All vehicle systems - Off
  8. Disconnect the electrical connector: B87 Rearview Camera
  9. Locate the appropriate pinout adapter and load test loop adapter from EL-52552 COAX FAKRA Cable Adaptor Kit.
  10. Connect the 2 adapters together, measure and record the resistance between the terminals at the pinout adapter.
  11. Disconnect the 2 adapters and connect each one to the appropriate end of the coax cable.
  12. At the pinout adapter test terminals, measure the total resistance of the coax cable loop including the connected load test adapter.
    • If not within 5 Ω of the reading from step 10. 

      Replace the coax cable

    • Go to next step: If within 5 Ω of the reading from step 10. 
  13. Replace the component: B87 Rearview Camera
  14. Apply the parking brake.
  15. Engine Running Transmission in Reverse
  16. Verify DTC B127B is not set
    • If the DTC is set 

      Replace the component: A11 Radio

    • Go to next step: If the DTC is not set 
  17. All OK.
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