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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 and all vehicle systems OFF, disconnect inline harness connector X434. 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 control circuit terminals listed below and ground.
    • Inline harness connector X434 - Control circuit terminal 1
    • Inline harness connector X434 - Control circuit terminal 2
    • 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 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 K23 Folding Top Control Module.
    • Go to next step: If less than 10 Ω 
  3. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the M86 Folding Top Header Latch Motor Open and Close states with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K23 Folding Top Control Module.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K23 Folding Top Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K23 Folding Top Control Module, ignition ON.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, K23 Folding Top Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  5. Ignition OFF, connect inline harness connector X434
  6. Disconnect the harness connector at the M86 Folding Top Header Latch Motor.
  7. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.
  8. Verify the test lamp turns ON when commanding the M86 Folding Top Header Latch Motor Open and Close states with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K23 Folding Top Control Module.
    2. Test for infinite resistance between each 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 each 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 M86 Folding Top Header Latch Motor.
    • Go to next step: If the test lamp turns ON and OFF 
  9. Test or replace the M86 Folding Top Header Latch Motor.
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