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Home >> Cadillac >> 2016 >> XTS Premium, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 (M7U), 6T75 (M7V), Or 6T80 (Mhm) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Upshift Switch Circuit/Downshift Switch Circuit/Up and Down Shift Switch Circuit >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    You must perform the Circuit/System Verification first.

  1. Ignition OFF.
  2. Remove the steering wheel spoke cover. Refer to Steering Wheel Spoke Cover Replacement .
  3. Disconnect the harness connector from the S2L Transmission Manual Shift Switch - Left.
  4. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  5. Ignition ON.
  6. Test for 11 V or greater between the signal circuit terminal 1 of the S2L Transmission Manual Shift Switch - Left connector and ground.
    • If less than 11 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance
      1. Disconnect the harness connector from the S2R Transmission Manual Shift Switch - Right.
      2. Test for infinite resistance between the signal circuit terminal 1 and ground.
        • If less than infinite resistance, repair the short to ground on the circuit.
        • If infinite resistance
      3. Test for infinite resistance between the signal circuit terminal 3 at the S2R Transmission Manual Shift Switch - Right connector and ground.
        • If less than infinite resistance, replace the steering wheel pad accessory wiring harness.
        • If infinite resistance, replace the S2R Transmission Manual Shift Switch - Right.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If 11 V or greater 
  7. Ignition OFF, disconnect the harness connector from the S2R Transmission Manual Shift Switch - Right.
  8. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  9. Ignition ON.
  10. Test for 11 V or greater between the signal circuit terminal 1 of the S2R Transmission Manual Shift Switch - Right connector and ground.
    • If less than 11 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If 11 V or greater 
  11. Test or replace the inoperative switch.
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