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Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF.
  2. Verify the video interface cable is properly connected at the P17 Info Display Module X2 and A11 Radio X5 connections and there is no damage to the cable or connections.
    • If connection problems or cable damage is noted. 

      Perform the appropriate repair or replacement to correct any issues.

    • Go to next step: If no issues are found with the video interface cable. 
  3. Disconnect the X1 harness connector at the P17 Info Display Module.
  4. Test for less than 10 Ω between the ground circuit terminal 2 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.
    • Go to next step: If less than 10 Ω 
  5. Verify that a test lamp illuminates between the B+ circuit terminal 1 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 B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, 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 B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the P17 Info Display Module.
    • Go to next step: If the test lamp illuminates. 
  6. Ignition ON, radio ON.
  7. Verify that a test lamp illuminates between the control circuit terminal 6 and ground.
    • If the test lamp does not illuminate. 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the A11 Radio.
    • Go to next step: If the test lamp illuminates. 
  8. Ignition ON, lights ON, test for 1 - 8 V between the dimming control circuit terminal 3 and ground.
    • If less than 1 V 
    1. Ignition OFF, disconnect the X4 harness connector at the A11 Radio.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the A11 Radio.
    • If greater than 8 V 
    1. Ignition OFF, disconnect the X4 harness connector at the A11 Radio. Ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the A11 Radio.
    • Go to next step: If between 1 - 8 V 
  9. Replace the video interface cable.
  10. Connect all harness connectors.
  11. Ignition ON, radio ON.
  12. Verify the P17 Info Display Module turns on and information is shown on the display.
    • If the P17 Info Display Module does not turn on, or information is not shown in the display. 
    1. Replace the P17 Information Display Module.
    2. Ignition ON, radio ON.
    3. Verify the P17 Info Display Module turns on and information is shown on the display.
      • If the information display malfunctions, replace the A11 Radio.
    • Go to next step: If the info display module turns on and information is shown on the display. 
  13. All OK
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