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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Up and Down Shift Switches >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    You must perform the Circuit/System Verification first.

  1. Ignition OFF, disconnect the harness connector from the S3 Transmission Shift Lever.
  2. Test for less than 10Ω between the shift lever harness connector terminal 2 and ground.
    • If 10Ω or greater 

      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 S3 Transmission Shift Lever harness connector ignition circuit terminal 1 and ground circuit terminal 2.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for less than 2Ω in the ignition circuit end to end.
      • If 2Ω or greater, repair the ignition circuit.
      • If less than 2Ω, replace the K9 Body Control Module.
    • If the test lamp illuminates 
  5. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
  6. Test for infinite resistance between the S3 Transmission Shift Lever harness connector signal circuit terminal 3 and ground.
    • If less than infinite resistance 

      Repair the short to ground in the circuit.

    • If infinite resistance 
  7. 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 
  8. Connect the K9 Body Control Module harness connector, ignition ON.
  9. Verify the scan tool Driver Shift Control parameter displays inactive.
    • If Driver Shift Control Mode Parameter does not display Inactive 

      Replace the K9 Body Control Module.

    • If Driver Shift Control Parameter displays Inactive 
  10. Test for 11-13 volts at the S3 Transmission Shift Lever harness connector between signal circuit terminal 3 and ground.
    • If not between 11-13 volts 

      Replace the K9 Body Control Module.

    • If between 11-13 volts 
  11. Ignition OFF, connect the S3 Transmission Shift Lever harness connector, Ignition ON.
  12. Test for 11-13 volts by back probing the transmission shift lever connector between terminal 3 and ground with the shift lever in Park, Reverse, Neutral, and Drive.
    • If not between 11-13 volts 

      Replace the S3 Transmission Shift Lever.

    • If between 11-13 volts 
  13. Shift Lever left of D position
  14. Test for 8.0-10.6 volts between S3 Transmission Shift Lever connector terminal 3 and ground.
    • If not between 8.0-10.6 volts 

      Replace the S3 Transmission Shift Lever.

    • If between 8.0-10.6 volts 
  15. Test for 5.1-7.3 volts between S3 Transmission Shift Lever connector terminal 3 and ground with the shift lever pressed rearward.
    • If not between 5.1-7.3 volts 

      Replace the S3 Transmission Shift Lever.

    • If between 5.1-7.3 volts 
  16. Test for 2.0-4.6 volts between S3 Transmission Shift Lever connector terminal 3 and ground with the shift lever pressed forward.
    • If not between 2.0-4.6 volts 

      Replace the S3 Transmission Shift Lever.

    • If between 2.0-4.6 volts 
  17. Replace the K9 Body Control Module.
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