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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.

Diagnostic A

  1. Ignition OFF, disconnect inline harness connector X433, it may take up to 2 min for all vehicle systems to power down.
    NOTE:

    All testing is done at the K23 Folding Top Control Module harness side of the connector.

  2. Test for less than 10 Ω between the low reference circuit terminal 7 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K23 Folding Top Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K23 Folding Top Control Module.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for 10 V or greater between signal circuit terminal 3 and ground.
    • If less than 10 V 
    1. Ignition OFF, disconnect the harness connector at the K23 Folding Top Control Module.
    2. Test for infinite resistance between the signal 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 signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K23 Folding Top Control Module.
    • Go to next step: If 10 V or greater 
  5. Disconnect the harness connector at K23 Folding Top Control Module.
  6. Test for less than 1 V between signal circuit terminal 12 X2 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  7. Replace the B251 Folding Top Down Position Sensor.

Diagnostic B

  1. Ignition OFF, disconnect inline harness connector X433, it may take up to 2 min for all vehicle systems to power down.
    NOTE:

    All testing is done at the K23 Folding Top Control Module harness side of the connector.

  2. Test for less than 10 Ω between the low reference circuit terminal 7 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K23 Folding Top Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K23 Folding Top Control Module.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for 10 V or greater between signal circuit terminal 4 and ground.
    • If less than 10 V 
    1. Ignition OFF, disconnect the harness connector at the K23 Folding Top Control Module.
    2. Test for infinite resistance between the signal 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 signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K23 Folding Top Control Module.
    • Go to next step: If 10 V or greater 
  5. Disconnect the harness connector at K23 Folding Top Control Module.
  6. Test for less than 1 V between the signal circuit terminal 11 X2 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  7. Ignition OFF, Connect inline harness connector X433.
  8. Cut both wires approximately 8 cm (3 in) from the B252 Folding Top Up Position Sensor.
    NOTE:
    • Use the appropriate schematic to determine which color wire to test.
    • All testing is done at the K23 Folding Top Control Module harness side of the wire.
  9. Test for less than 10 Ω between the low reference circuit and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the inline harness connector X433.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • Go to next step: If less than 10 Ω 
  10. Ignition ON.
  11. Test for 10 V or greater between the signal circuit and ground.
    • If less than 10 V 
    1. Ignition OFF, disconnect the harness connector at the K23 Folding Top Control Module.
    2. Test for infinite resistance between the signal 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 signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • Go to next step: If 10 V or greater 
  12. Disconnect the harness connector at K23 Folding Top Control Module.
  13. Test for less than 1 V between signal circuit terminal 11 X2 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  14. Replace the B252 Folding Top Up Position Sensor.
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