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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 and all vehicle systems OFF, disconnect the KR76 Retained Accessory Power Relay. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 11 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 15 and ground.
    • If the test lamp does not illuminate 

      Replace the X51A Fuse Block - Instrument Panel

    • Go to next step: If the test lamp illuminates 
  5. Connect a test lamp between the control circuit terminal 13 and the ground circuit terminal 11.
  6. Verify the test lamp turns ON and OFF when commanding the Accessory/Retained Accessory Power Relay On and Off with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control 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 control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  7. Connect the KR76 Retained Accessory Power Relay.
  8. Disconnect the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle.
  9. Ignition OFF.
  10. Verify that a test lamp does not illuminate between each of the ignition circuits listed below and ground.
    • E32 Cigarette Lighter Receptacle - Ignition circuit terminal A
    • X80H Accessory Power Receptacle - Console Center - Ignition circuit terminal A
    • X80G Accessory Power receptacle - Instrument Panel - Ignition circuit terminal A
    • If the test lamp illuminates 

      Repair the short to voltage on the ignition circuit.

    • Go to next step: If the test lamp does not illuminate 
  11. Ignition ON.
  12. Verify that a test lamp illuminates between each of the ignition circuits listed below and ground.
    • E32 Cigarette Lighter Receptacle - Ignition circuit terminal A
    • X80H Accessory Power Receptacle - Console Center - Ignition circuit terminal A
    • X80G Accessory Power receptacle - Instrument Panel - Ignition circuit terminal A
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the KR76 Retained Accessory Power Relay.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle.
    • Go to next step: If the test lamp illuminates 
  13. Test or replace the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle.
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