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Home >> Cadillac >> 2017 >> Escalade ESV Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Automatic Transmission - 6L80 (MYC) Or 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, P0826, or P1876: Up and Down Shift Switches >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF and all vehicle systems OFF. Disconnect the harness connector at the S3 Transmission Shift Lever. It may take up to 2 min. for all vehicle systems to power down.
  2. Test for less than 5 Ω between the ground circuit terminal C and ground.
    • If greater than 5 Ω 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit wire end to wire end.
      • If 2 Ω or greater, repair the open/high resistance in the wire circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 5 Ω 
  3. Ignition OFF.
  4. Test for less than 1 V on the signal circuit terminal D at the S3 Transmission Shift Lever harness connector.
    • If greater than 1 V 
    1. Ignition OFF.
    2. Disconnect the X3 harness connector at the K9 Body Control Module. Ignition ON.
    3. Test for less than 1 V on the signal circuit terminal D at the S3 Transmission Shift Lever harness connector and ground.
      • If 1 V or greater, repair the short to B+/Ignition in the signal circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • If less than 1 V 
  5. Ignition ON.
  6. Test for 11.6 - 12.4 V on the signal circuit terminal D at the S3 Transmission Shift Lever harness connector and ground.
    • If not between 11.6 - 12.4 V 
    1. Ignition OFF.
    2. Disconnect the X3 harness connector at the K9 Body Control Module.
    3. Test for less than 2 Ω in the signal circuit wire end to wire end.
      • If greater than 2 Ω, repair the open/high resistance in the wire circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If between 11.6 - 12.4 V 
  7. Test or replace the S3 Transmission Shift Lever.
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