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Home >> Cadillac >> 2017 >> CTS V >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, P0826 or P1876: Up and Down Shift Switch >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, verify the scan tool Driver Shift Control Mode parameter changes from Inactive to Active while placing the S3 Transmission Shift Lever into the manual mode position.
    • If Active is not displayed 

      Refer to Circuit/System Testing.

    • If Active is displayed 
  2. Verify the scan tool Up and Down Shift Switch parameter displays UP when pressing the plus (+) switch and Down when pressing the minus (-) switch.
    • If the parameter does not display the correct value 

      Refer to Circuit/System Testing.

    • If the parameter does display the correct value 
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  5. All OK.
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