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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Electrical >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC B097F: Transmission Tow Mode Indicator >> Circuit/System Testing

Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

  1. Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel and the X3 harness connector at the K9 Body Control Module. Ignition ON.
  2. Test for less than 1 V between the signal circuit terminal 2 and ground.
    • If 1 V or greater 

      Repair the short to voltage in the circuit.

    • If less than 1 V 
  3. Test for infinite resistance between the signal circuit terminal 2 and ground.
    • If less than infinite resistance 

      Repair the short to ground in the circuit.

    • If infinite resistance 
  4. Test for less than 2Ω in the signal circuit end to end.
    • If 2Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2Ω 
  5. Ignition OFF, connect the harness connector X3 at the K9 Body Control Module. Ignition ON.
  6. Test for less than 1V between the control circuit terminal 18 and ground.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the harness connector X5 at the K9 Body Control Module.
    2. Test for less than 1V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1V, replace the K9 Body Control Module.
    • If less than 1 V 
  7. Verify a test lamp illuminates between the B+ circuit terminal 14 and ground.
    • If the test lamp does not illuminate and the circuit fuse is OK 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, K9 Body Control Module.
    • If the test lamp illuminates 
  8. Connect a test lamp between the control circuit terminal 18 and B+, ignition ON.
  9. Verify the test lamp turns ON and OFF when commanding the Tour Switch Indicator Active and Inactive with a scan tool.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
    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, replace the K9 Body Control Module
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module.
    2. Test for less than 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the control circuit.
      • If less than 2Ω, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  10. Test or replace the S48A Multifunction Switch - Instrument Panel.
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