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Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the X63A Junction Block - Rear Body. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 29 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 26 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the B87 Rearview Camera.
    • If the test lamp illuminates 
  5. Engine running, park brake applied, transmission in R.
  6. Verify a test lamp illuminates between the control circuit terminal 25 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
    • If the test lamp illuminates 
  7. Ignition OFF, disconnect the X2 harness connector at the A11 Radio, ignition ON.
  8. Test for less than 1 V between the signal circuit terminals listed below and ground:
    • A11 Radio signal (+) circuit terminal 5 X2
    • A11 Radio signal (+) circuit terminal 6 X2
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  9. Test for infinite resistance between the signal circuit terminals listed below and ground:
    • A11 Radio signal (+) circuit terminal 5 X2
    • A11 Radio signal (+) circuit terminal 6 X2
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  10. Test for less than 2 Ω between the A11 Radio signal (+) circuit terminal 5 X2 and the X63A Junction Block - Rear Body signal (+) circuit terminal 27.
    • If 2 Ω or greater 

      Repair the open/high resistance on the circuit.

    • If less than 2 Ω 
  11. Test for less than 2 Ω between the A11 Radio signal (-) circuit terminal 6 X2 and the X63A Junction Block - Rear Body signal (-) circuit terminal 28.
    • If 2 Ω or greater 

      Repair the open/high resistance on the circuit.

    • If less than 2 Ω 
  12. Replace the B87 Rearview Camera.
  13. Engine running, transmission in R,
  14. Verify a clear rear vision image is displayed on the P17 Info Display Module.
    • If a clear rear vision image is not displayed 

      Replace the A11 Radio.

    • If a clear rear vision image is displayed 
  15. All OK.
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