LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P1876: Up and Down Shift Enable Switch >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    You must perform Circuit/System Verification first.

  1. Ignition OFF, disconnect the harness connector from the S3 Transmission Shift Lever. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 between the S3 Transmission Shift Lever harness connector terminal 2 and ground.
    • If 10 or greater 
    1. Ignition OFF.
    2. Test the ground circuit for less than 2 end to end.
    • If greater than 2, repair the open/high resistance in the circuit.
    • If less than 2, repair the open/high resistance in the ground connection.
    • If less than 10 
  3. Ignition ON.
  4. Verify the scan tool Driver Shift Control parameter displays inactive.
    • If Driver Shift Control Parameter does not display Inactive 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the transmission shift lever vehicle harness connector signal circuit terminal 3 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 Driver Shift Control Parameter displays Inactive 
  5. 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.
    2. Test for less than 2 in the ignition circuit end to end.
    • If 2 or greater, repair the ignition circuit.
    • If less than 2, replace the K9 Body Control Module.
    • If the test lamp illuminates 
  6. Test for 11V or greater at the S3 Transmission Shift Lever harness connector between signal circuit terminal 3 and ground.
    • If less than 11V 
    1. Ignition OFF, disconnect the connector at the K9 Body Control Module.
    2. Test for less than 2 in the signal circuit wire end to end.
      • If 2 or greater, repair the open/high resistance in the signal circuit wire.
      • If less than 2, replace the K9 Body Control Module.
    • If 11V or greater 
  7. Ignition OFF, connect the S3 Transmission Shift Lever harness connector, ignition ON.
  8. Test for 11V or greater between the S3 Transmission Shift Lever connector terminal 3 and ground in the park, reverse, neutral, and drive gear select lever positions by back probing the connector.
    • If less than 11V 

      Replace the S3 Transmission Shift Lever.

    • If 11V or greater 
  9. Shift selector lever left of the D position.
  10. Test for 8.0-10.6V between the S3 Transmission Shift Lever connector terminal 3 and ground.
    • If not between 8.0-10.6V 
    1. Ignition OFF.
    2. Test the signal circuit for less than 2 end to end.
    • If 2 or greater, repair the open/high resistance in the circuit.
    • If less than 2, replace the S3 Transmission Shift Lever.
    • If between 8.0-10.6V 
  11. Test for 5.1-7.3V between the S3 Transmission Shift Lever connector terminal 3 and ground with the shift lever pressed forward.
    • If not between 5.1-7.3V 
    1. Ignition OFF.
    2. Test the signal circuit for less than 2 end to end.
    • If 2 or greater, repair the open/high resistance in the circuit.
    • If less than 2, replace the S3 Transmission Shift Lever.
    • If between 5.1-7.3V 
  12. Test for 2.0-4.6V between the S3 Transmission Shift Lever connector terminal 3 and ground with the shift lever pressed rearward.
    • If not between 2.0-4.6V 
    1. Ignition OFF.
    2. Test the signal circuit for less than 2 end to end.
    • If 2 or greater, repair the open/high resistance in the circuit.
    • If less than 2, replace the S3 Transmission Shift Lever.
    • If between 2.0-4.6V 
  13. Replace the K9 Body Control Module.
scientia non olet · About LEMON Manuals