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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.

Cruise Control Switch Signal

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the component: K9 Body Control Module
  3. Disconnect the component: Cruise Control Switch Assembly
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for less than 1 V between the test points:
    • 12 V Reference circuit & Ground
    • Cruise Control Switch Signal & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  6. Ignition/Vehicle - Off
  7. Test for infinite resistance between the test points:
    • 12 V Reference circuit & Ground
    • Cruise Control Switch Signal & 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 ohms between the test points:
    • 12 V Reference circuit@Component harness & The other end of the circuit@Control module harness
    • Cruise Control Switch Signal@Component harness & The other end of the circuit@Control module harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • Go to next step: If less than 2 ohms
  9. Test or replace the component: Cruise Control Switch Assembly
  10. Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set.
    • If the DTC sets 

      Replace the component: K9 Body Control Module

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

Adaptive Cruise Control Gap Up/Down Switch Signal

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the component: K9 Body Control Module
  3. Disconnect the component: Cruise Control Switch Assembly
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for less than 1 V between the test points:
    • 12 V Reference circuit & Ground
    • Adaptive Cruise Control Gap Up/Down Switch Signal & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  6. Ignition/Vehicle - Off
  7. Test for infinite resistance between the test points:
    • 12 V Reference circuit & Ground
    • Adaptive Cruise Control Gap Up/Down Switch Signal & 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 ohms between the test points:
    • 12 V Reference circuit@Component harness & The other end of the circuit@Control module harness
    • Adaptive Cruise Control Gap Up/Down Switch Signal@Component harness & The other end of the circuit@Control module harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • Go to next step: If less than 2 ohms
  9. Test or replace the component: Cruise Control Switch Assembly
  10. Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set.
    • If the DTC sets 

      Replace the component: K9 Body Control Module

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