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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 >> DTC B097B: Power Mode Start Switch >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all systems OFF, disconnect the harness connector at the S38 Ignition Mode Switch. 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 4 and ground.
    • If 10Ω or greater 
    1. 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. Test for less than 10Ω between the low reference circuit terminal 7 and ground.
    • If 10Ω or greater 
    1. 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, replace the K84 Keyless Entry Control Module.
    • If less than 10Ω 
  4. Connect the S38 Ignition Mode Switch, ignition ON.
  5. Disconnect the S38 Ignition Mode Switch.
  6. Verify the scan tool Body Control Module Push Button Ignition Switch Voltage parameter is greater than 11V.
    • If 11V or less 
    1. Connect the S38 Ignition Mode Switch.
    2. Ignition OFF, disconnect the harness connector at the K9 Body Control Module and S38 Ignition Mode Switch.
    3. Test for infinite resistance between the signal circuit terminal 6 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If greater than 11V 
  7. Install a 3A fused jumper wire between the signal circuit terminal 6 and ground.
  8. Verify the scan tool Body Control Module Push Button Ignition Switch Voltage parameter is less than 1V.
    • If 1V or greater 
    1. Disconnect the harness connector at the K9 Body Control Module.
    2. Test for less than 1V between the signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Test for less than 2Ω in signal 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 less than 1V 
  9. Connect the harness connector at the S38 Ignition Mode Switch.
  10. Verify the scan tool Body Control Module Push Button Ignition Switch Voltage parameter is 8-10V, with the S38 Ignition Mode Switch released.
    • If not between 8-10V 

      Test or replace the S38 Ignition Mode Switch.

    • If between 8-10V 
  11. Verify the scan tool Body Control Module Push Button Ignition Switch Voltage parameter is 4-7V, with the S38 Ignition Mode Switch pressed.
    • If not between 4-7V 

      Test or replace the S38 Ignition Mode Switch.

    • If between 4-7V 
  12. Disconnect the X1 harness connector at the K84 Keyless Entry Control Module.
  13. Test for infinite resistance between the signal circuit terminal 11 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  14. Ignition ON.
  15. Test for less than 1V between the signal circuit terminal 11 and ground.
    • If 1V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1V 
  16. Test for 4.5-5.5 kΩ between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S38 Ignition Mode Switch released.
    • If not between 4.5-5.5 kΩ 
    1. Ignition OFF, disconnect the harness connector at the S38 Ignition Mode Switch.
    2. Test for less than 2Ω in signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, test or replace the S38 Ignition Mode Switch.
    • If between 4.5-5.5 kΩ 
  17. Test for 1-1.5 kΩ between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S38 Ignition Mode Switch pressed.
    • If not between 1-1.5 kΩ 

      Test or replace the S38 Ignition Mode Switch.

    • If between 1-1.5 kΩ 
  18. Replace the K84 Keyless Entry Control Module.
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