LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2019 >> Encore Base >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> Cruise Control Malfunction >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

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.
scientia non olet · About LEMON Manuals