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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 197 (Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, P0826, or P1876: Upshift/Downshift/Enable Switch >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  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 2 and ground.
    • If 5 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If greater than 2 Ω, repair the Open/High resistance in the circuit.
      • If less than 2 Ω, repair the ground connection.
    • If less than 5 Ω 
  3. Ignition ON.
  4. Test for 11-13 V between the signal circuit terminal 3 and ground.
    • If not between 11-13 V 
    1. Ignition OFF, disconnect the 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 in 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 between 11-13 V 
  5. Ignition OFF, place the transmission shift lever in the M or manual mode position.
  6. Test for the following resistance values between terminal 3 and terminal 2 on the S2 Transmission Manual Shift Switch, for the conditions listed below:
    • 500-700 Ω - Plus (+) button pressed
    • 1800-2200 Ω - Minus (-) button pressed
    • 5900-6300 Ω - Neither button pressed
    • If resistance values are not correct 

      Replace the S2 Transmission Manual Shift Switch.

    • If resistance values are correct 
  7. Replace the K9 Body Control Module.
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