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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Wiring Systems And Power Management - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Retained Accessory Power Malfunction >> Circuit/System Testing

Circuit/System Testing

Diagnostic A

  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 10Ω between the ground circuit terminal 11 and ground.
    • If 10Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 10Ω 
  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

    • 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.
      • If infinite resistance
    3. Test for less than 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, 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 1V between the control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  7. Connect the KR76 Retained Accessory Power Relay.
  8. Disconnect the appropriate X80 Accessory Power Receptacle.
  9. Ignition OFF.
  10. Verify that a test lamp does not illuminate between each of the ignition circuits listed below and ground.
    • 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.

    • 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.
    • 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 2Ω in the ignition circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, 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.
    • If the test lamp illuminates 
  13. Test or replace the appropriate X80 Accessory Power Receptacle.

Diagnostic B

  1. Ignition OFF and all vehicle systems OFF, disconnect the P2 Transmission Shift Lever Position Indicator and S3 Transmission Shift Lever.
  2. Connect a test lamp between each of the ignition circuits listed below and ground.
    • P2 Transmission Shift Lever Position Indicator - Ignition circuit terminal 1
    • S3 Transmission Shift Lever - Ignition circuit terminal X2-1
  3. 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, remove test lamp, disconnect the harness connector at the K9 Body Control Module.
    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.
    3. Test for less than 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1V between the control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  4. Test or replace the appropriate P2 Transmission Shift Lever Position Indicator or S3 Transmission Shift Lever.
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