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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.
  1. Ignition/Vehicle - Off
  2. Disconnect the component: G36 Auxiliary Heater Coolant Pump
  3. Ignition - On / Vehicle - In Service Mode
  4. Perform the scan tool control function: Auxiliary Coolant Pump - On
  5. Verify a test lamp turns On between the test points: Control circuit terminal 2 @ Component harness & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Remove the component: X50A Fuse Block - Underhood
    3. Disconnect the electrical connector: X1 @ K20 Engine Control Module
    4. Test for infinite resistance between the test points: Terminal X1 66 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    5. Test for less than 2 ohms between the test points: Terminal X1 66 @ Control module harness & Terminal X4 C4 @ X50A Fuse Block - Underhood
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 ohms
    6. Test for less than 2 ohms between the test points: Terminal X4 B2 @ X50A Fuse Block - Underhood & Control circuit terminal 2
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: X50A Fuse Block - Underhood
    7. Connect the electrical connector: X1 @ K20 Engine Control Module
    8. Ignition - On / Vehicle - In Service Mode
    9. Perform the scan tool control function: Auxiliary Coolant Pump - On
    10. Verify a test lamp turns On between the test points: Control circuit terminal 2 @ Component harness & Ground
      • If the test lamp does not turn On and Off - Test or replace the component: K20 Engine Control Module
      • Go to next step: If the test lamp turns On
    11. Refer to step 7
  6. If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for infinite resistance between the test points: Control circuit terminal 2 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Replace the component: F92UA Fuse
    4. Ignition - On / Vehicle - In Service Mode
    5. Perform the scan tool control function: Auxiliary Coolant Pump - On
    6. Verify a test lamp turns On between the test points: Control circuit terminal 2 @ Component harness & Ground
      • If the test lamp does not turn On Replace the component: X50A Fuse Block - Underhood
      • Go to next step: If the test lamp turns On
    • Go to next step: If the test lamp turns On 
  7. Test for less than 2 ohms between the test points: Terminal 1 @ Component harness & Ground
    • If 2 ohms or greater 
    • Repair the open/high resistance in the circuit.
    • Go to next step: If less than 2 ohms 
  8. Connect the electrical connector: G36 Auxiliary Heater Coolant Pump
  9. Perform the scan tool control function: Auxiliary Coolant Pump - On & Off
  10. Verify the component turns On and Off:
    • If the component does not turn On and Off 
    • Replace the component: G36 Auxiliary Heater Coolant Pump
    • Go to next step: If the component turns On and Off 
  11. All OK
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