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Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: S48E Multifunction Switch - Center Console
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 1 & Ground
    • If 10 ohms or greater 
    1. Test for less than 2 ohms between the test points: Ground circuit terminal 1 @ Component harness & Ground terminal
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. Headlamp Switch = On
  6. Verify a test lamp turns On between the test points: Control circuit terminal 3 & Ground
    • Go to next step: If the test lamp turns On 
  7. Ignition/Vehicle - Off & Remove - Test lamp
  8. Connect the electrical connector: S48E Multifunction Switch - Center Console
  9. Disconnect the electrical connector: X3 & X6 @ K9 Body Control Module
  10. Test for infinite resistance between the test points:
    • Signal circuit terminal 14 X3 & Ground
    • Signal circuit terminal 22 X6 & Ground
    • If less than infinite resistance 
    1. Disconnect the electrical connector: S48E Multifunction Switch - Center Console
    2. Test for infinite resistance between the test points:
      • Signal circuit terminal 14 X3 @ Control module harness & Ground
      • Signal circuit terminal 22 X6 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: S48E Multifunction Switch - Center Console
    • Go to next step: If infinite resistance 
  11. Press and hold the switch: Sport Mode @ S48E Multifunction Switch - Center Console

    Test for less than 10 ohms between the test points: Signal circuit terminal 22 X6 & Ground

    • If 10 ohms or greater 
    1. Disconnect the electrical connector: S48E Multifunction Switch - Center Console
    2. Test for less than 2 ohms between the test points: Signal circuit terminal 22 X6 @ Control module harness & Signal circuit terminal 12 @ Component harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S48E Multifunction Switch - Center Console
    • Go to next step: If less than 10 ohms 
  12. Press and hold the switch: Tour Mode @ S48E Multifunction Switch - Center Console

    Test for less than 10 ohms between the test points: Signal circuit terminal 14 X3 & Ground

    • If 10 ohms or greater 
    1. Disconnect the electrical connector: S48E Multifunction Switch - Center Console
    2. Test for less than 2 ohms between the test points: Signal circuit terminal 14 X3 @ Control module harness & Signal circuit terminal 14 @ Component harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S48E Multifunction Switch - Center Console
    • Go to next step: If less than 10 ohms 
  13. Connect the electrical connector: X3 & X6 @ K9 Body Control Module
  14. Disconnect the electrical connector: X5 @ K9 Body Control Module
  15. Ignition - On/Vehicle - In Service Mode
  16. Headlamp Switch = On
  17. Verify the component works as specified:
    • Tour Mode - LED (Light Emitting Diode) @ S48E Multifunction Switch - Center Console = Off
    • Sport Mode - LED (Light Emitting Diode) @ S48E Multifunction Switch - Center Console = Off
    • If the component does not work as specified 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: S48E Multifunction Switch - Center Console
    3. Test for infinite resistance between the test points:
      • Control circuit terminal 8 X5 @ Control module harness & Ground
      • Control circuit terminal 17 X5 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: S48E Multifunction Switch - Center Console
    • Go to next step: If the component works as specified 
  18. Connect a 3 A fused jumper wire between the test points: Control circuit terminal 8 X5 & Ground

    Verify the component works as specified: Sport Mode - LED (Light Emitting Diode) @ S48E Multifunction Switch - Center Console = On

    • If the component does not work as specified 
    1. Disconnect the electrical connector: S48E Multifunction Switch - Center Console
    2. Test for less than 1 V between the test points: Control circuit terminal 8 X5 @ Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Ignition/Vehicle - Off
    4. Test for less than 2 ohms between the test points: Control circuit terminal 8 X5 @ Control module harness & Control circuit terminal 13 @ Component harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S48E Multifunction Switch - Center Console
    • Go to next step: If the component works as specified 
  19. Connect a 3 A fused jumper wire between the test points: Control circuit terminal 17 X5 & Ground

    Verify the component works as specified: Tour Mode - LED (Light Emitting Diode) @ S48E Multifunction Switch - Center Console = On

    • If the component does not work as specified 
    1. Disconnect the electrical connector: S48E Multifunction Switch - Center Console
    2. Test for less than 1 V between the test points: Control circuit terminal 17 X5 @ Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Ignition/Vehicle - Off
    4. Test for less than 2 ohms between the test points: Control circuit terminal 17 X5 @ Control module harness & Control circuit terminal 15 @ Component harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S48E Multifunction Switch - Center Console
    • Go to next step: If the component works as specified 
  20. Replace the component: K9 Body Control Module
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