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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, disconnect the harness connector at the appropriate B51 Suspension Height Sensor, ignition ON.
  2. Verify a test lamp illuminates between the low reference circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K26 Headlamp 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 K26 Headlamp Control Module.
    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 3 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the K26 Headlamp Control Module.
    2. Test for infinite resistance between the 5 V reference 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 5 V 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 K26 Headlamp Control Module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the K26 Headlamp Control Module, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K26 Headlamp Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
  5. Test for less than 1 V between the signal circuit terminal 2 and ground.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the harness connector at the K26 Headlamp Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 2 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K26 Headlamp Control Module.
    • Go to next step: If less than 1 V 
  6. Ignition OFF, disconnect the harness connector at the K26 Headlamp Control Module.
  7. Test for infinite resistance between the signal circuit terminal 2 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  8. Test for less than 2 Ω between the B51 Suspension Height Sensor signal circuit terminal 2 and the appropriate K26 Headlamp Control Module signal circuit terminal.
    • If 2 Ω or greater 

      Repair the open or high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  9. Test or replace the appropriate B51 Suspension Height Sensor.
  10. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
    • If the DTC sets 

      Replace the K26 Headlamp Control Module.

    • Go to next step: If the DTC does not set 
  11. All OK.
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